Php ipn paypal recurring jobs

I'm looking to build a social networking script in PHP, inspired by Twitter. - I need user profiles, a news feed, and a messaging system, like most social networks. - The standout feature will be similar to Twitter threads: - Users should be able to respond to a tweet with threaded conversations. - There should be visibility controls for these threads. Another key requirement is for this script to support tweet threads, unlike in Twitter where it is mainly a single message. Ideal Skills: - Proficiency in PHP for scripting the networking features - Familiarity with popular social networking sites, especially Twitter, to effectively implement the thread feature - Experience with database management for user profiles and messaging systems - Solid understanding of...

...interactive feedback form creating. It will sit on a platform and integrate within a website, where visitors who wish to use the form, can sign up as a basic user and use the feedback form for free, (this is the original form template we create and is un-editable), or have the option to subscribe as a form creator on a monthly or annually payment plan. via payment gateways such as Apple pay, Paypal, Stripe or use of credit card as payment. If they subscribe as a form creator, then they will own a form (which is a copy of the original feedback form template) and have edit permissions and the ability to create multiple forms. Before I inform you of the things they can edit, i want to give you an idea of how the form works, I have also provided an image / example of a form (Thi...

We are embarking on an exciting project to develop an ecommerce website for health products using WordPress, and we need a proficient PHP and WordPress developer who can take on a range of tasks for our ecommerce project. Responsibilities will include: Mastering PHP Coding: Proficiency in PHP coding is essential for customizing and extending WordPress functionality to meet our specific requirements. Customizing WordPress Themes: We require expertise in customizing WordPress themes to ensure they align with our branding and design preferences while maintaining responsiveness and user-friendliness. Developing Unique and Functional Plugins: The developer should have experience in developing custom plugins to add unique features and functionalities to our ecommerce we...

In my website there is small bug while remembering youtube URLs which set to product images. You need to fix it. I created video about what I need. here is the link for you: First watch video then send BID.

I'm in need of an experienced PHP developer to assist with backend development and database management. The ideal candidate will be well-versed in both areas and able to handle tasks related to data processing and analytics. Key Responsibilities: - Need to create 6 to 8 dynamic pages - Create and manage database structures - Able to Upload Images using Mobile Browser (When We open link in mobile, it should be able to take images from camera and when we use Desktop, we should be able to browse the image) - Optimize system performance and troubleshoot issues - No Auto bid welcome The PHP developer should be able to work independently, follow best practices and be proactive in suggesting improvements. Previous experience with data processing, analytics, and system integra...

I'm in need of an experienced freelancer with extensive knowledge in QuickBooks Online (QBO) to handle a large volume of financial transactions. Specifically, the task is to reconcile bank, credit card, and PayPal transactions amounting to approximately 3000 transactions for the past 3 years. These transactional data are all available in Excel CSV format. The successful freelancer should be skilled at: - Extracting data from Excel CSVs into QBO - Performing reconciliation processes in QBO - Categorizing transactions accurately into Income and Expenses - Handling a large volume of financial data Your attention to detail and accuracy will be critical to the successful completion of this project. I look forward to working with a trustworthy professional who can ensure the i...

I need Php Laravel developer to work on existing admin pannel. Want to change the UI design & add some functionality. It is super urgent task that needs to be finish in max 1-2 days.

I'm looking for a Filament PHP v3 expert to develop a new application. The primary goal of this project is to build a new application from the ground up using the Filament PHP v3 framework. Key requirements: - Proficiency in Filament PHP v3. Experience in developing with this framework is crucial for this project. - Developing custom admin panels. I'm looking for a skilled developer who can create custom admin panels within the application. Ideal skills and experience: - Prior experience with Filament PHP v3 is a must. Please provide examples of previous projects where you've worked with this framework. - Strong understanding of backend development and creating custom admin panels. - Ability to work on your own initiative and take ownership of ...

Dear Freelancer, Please write carefully the job proposal We are looking for a PHP Laravel expert to modify a service we use in our company. To explain the solution we have: -It works like a ticketing service -Multi level of approval -Customer side is working fully What we need: -Be able to create "intern ticket" by employees -Help us to redefine roles and permissions (we know what we need but we need you to understand what we have and explain how it works clearly) -Make testing on all the roles and the workflow to be sure that people that don't need to see the ticket won't see it for example -Modify and create new fields with conditions -Assign a ticket category to a specific employee of a specific service After modifications we'll need future additions...

I'm in need of a talented developer who can help with a consistent, automated web scraping project focused o...Marriott etc Key Project Details: - The primary goal is to extract data for analysis purposes. - Data should be scraped from the targeted sites on a weekly basis automatically. Desired Skills and Experience: - Proficiency in web scraping techniques, particularly for airline, hotels, consumer platforms - Experience with automated website login methods for scraping - Ability to provide a reliable, recurring scraping solution - Strong understanding of data analysis and how to deliver the extracted data in a format that's ready for analysis Your help will be instrumental in ensuring I have the necessary data for my analysis. Looking forward to hearing from experi...

I'm looking for an experienced mobile app developer to create a members-only platform that displays and sells clothing merchandise and displays exclusives business partner doscounts. The app will be av...gateways is of utmost importance. - There will be a membership model where users will need to pay to access the exclusive merchandise & discount codes with business partners and avail exclusive discount codes with our partners. Required Skills: - Proficiency in creating secure, members-only platforms within mobile apps. - Expertise in integrating payment gateways, particularly Credit/Debit Card and PayPal. - Experience in developing cross-platform apps for iOS and Android. Please include your portfolio and any relevant experience in your bid. Looking forward to making ...

I'm looking for an experienced Python developer who can assist me with an ongoing issue I'm facing on my Windows machine. Every time I attempt to install Python 3.8, I encounter an error message that says 'distutils directory not found'. Despite my efforts in uninstalling and reinstalling Python, the problem persis...problem persists. Ideal Skills and Experience: - Python development expertise - Exceptional understanding of Python installation on Windows machines - Proven track record in troubleshooting and resolving Python installation errors Your task will be to identify the root cause of this issue, propose an effective solution, and walk me through the process so I can prevent the same problem from recurring in the future. I'll appreciate any assistan...

I'm looking for a skilled web developer to create a website for my motorhome hire business. This platform should offer an easy and intuitive booking service for potential customers. Key Features: - Secure Payment Methods: The website should support Credit card, PayPal and Bank transfer. Users should be able to select their preferred payment method with confidence. - Live Booking Calendar: A key feature of the website should be the live booking calendar. This will allow users to see the availability of motorhomes in real-time and choose a suitable time for their hire. Expectations: - Professionalism: I expect the website to reflect the professionalism and quality of my business. A clean, modern design is essential. - Experience: I'd like freelancers to include their pas...

...accessible for all users. ( easy to see listing & easy to post listing is a MUST ) - **Key Features**: The mobile version should have user-friendly navigation, advanced search filters, and an easy listing posting process. These features are crucial for usability and to encourage user engagement. - **Payment Integration**: The platform should support various payment options including credit card, PayPal, Bank Transfer, and Local Payment Apps. This would enable a smooth and convenient transaction process for users, crucial for the success and credibility of the website. Ideal Skills and Experience: - Proficient in web development with a focus on mobile responsiveness. - Experience in creating classified portals or similar platforms. - Prior work with integrating payment...

...website to new heights. Specifically, I need a PHP expert who can: 1. Implement new functionalities: • Twitter integration: I would like my web page to be able to post updates directly to Twitter. This requires knowledge of Twitter APIs and related compatibility issues. 2. Some fixes • The contact form is not working and needs to set up with a captcha to avoid SPAM. • A dynamic ajax gallery is not loading photos on a section 3. Design problem on one section, photos are not aligned on the center. 4. Intranet section failure when INSERT data to DATABASE, not always, just in some cases, will explain. Que hable español. Exceptional skills in PHP are fundamental. Familiarity with Twitter integration is vital. If you're the ...

More details: Which version(s) of PHP are you currently using in your API? This question was skipped What information should successful freelancers include in their application? Experience What is the primary function of your API? Data retrieval

I have several successful Startups. This time I'm looking for a person who can code with Midjourney API + Laravel. The idea is to create User Interface for Midjourney, where the user can log in and generate the images he needs to avoid the Discord App. There would be storage of images and scheduled generation. There will be a monthly subscription fee. We split shares 50/50. I will do Web Design, branding, and marketing. Also can help on Laravel UI, back-end (I'm back-end dev) Also can pay for this job 500-1000 euros, but the priority for pure cofounders. Suggestions for Midjourney API to use:

I have several successful Startups. This time I'm looking for a person who can code with Midjourney API + Laravel. The idea is to create User Interface for Midjourney, where the user can log in and generate the images he needs to avoid the Discord App. There would be storage of images and scheduled generation. There will be a monthly subscription fee. We split shares 50/50. I will do Web Design, branding, and marketing. Also can pay for this job 500-1000 euros, but the priority for pure cofounders.

...friendly * Maintaining system security and integrity through best practices * Providing information support for the administration team as needed * Participating in team efforts toward efficient and successful project planning including weekly virtual team meetings Job Requirements * 5+ Years Experience in backend or full stack development * Knowledge in ColdFusion (2018 or newer), Python, PHP, CFC, Javascript, SQL, MySSQL, Database Design, Server Management * Experience in front end user interface development,
HTML, and CSS * Knowledgeable in APls, both SOAP and REST * Knowledgeable in Windows server management * Strong problem solving skills * Forward thinking in all development * Strong time management skills * Self-starter * Detail oriented Projects ...

I'm in need of a skilled PHP developer who can handle a custom project. The project involves using PHP Basically i need a plugin. please apply with your portfolio of similar projects and detail your experience with PHP, particularly in custom web applications. Rest i will explain by chat.

We are a purchasing... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide :

Looking for an experienced PHP developer to refactor my existing codebase (SIBS PAYMENTS GATEWAY Implemented by PHP Jabbers on Cinema Booking Script). This codebase is primarily responsible for online payments and sending email notifications of payments and we need to enhance its functionality and performance. The tasks will include: - Adding a cron job feature to the existing PHP code - Verifying email notifications when payment statuses change -Adding details of the payment status to the database - Making sure our code complies with the best standards of security - Optimizing the code for better performance The app is online on Cloudways. Security, performance, and reliability are very important for this project. Freelancer must have previous experience in the men...

I need a PHP based form application that generates PDFs of varying math exercises. The app must flexibly create these exercises based on two factors: • User Input: The form should let the user input their specific requirements, including their chosen level of difficulty. • Random Generation: Despite the user's input, the app must also have the capacity to generate math problems randomly, creating a more diverse range of exercises. The app should be capable of producing exercises across several types of math problems: • Addition and Subtraction • Multiplication and Division • Fractions and Decimals As the level of difficulty varies from user to user, the form application must allow a feature whereby the user can select the difficulty level. The idea...

...looking to create a modern and sleek PHP template that comes equipped with a login and register system. This template should also include the following features: - Google Social Media Login: The primary platform for social media login should be Google. This means that users should be able to register and log in using their Google credentials. - Forgot password option: The system should have a "forgot password" feature that allows users to reset their password in case they forget it. Your responsibilities will include designing and developing these functionalities, ensuring that they are both user-friendly and secure. It's key that the design of the template reflects a modern and sleek aesthetic. Ideal candidates for this project should have: - Proficiency in ...

Hello, Task detail - Upload text file ( large content ) --> send contents to chatgpt api and get new contents ( split content and send to chatpgpt api in real-time -- > output as new text file ( download ) Budget 1000 INR Timeline - 1 day please note currently chatgpt have limitation to sending words , you will have to make system so from document you can split it and send to chatgpt api and as out put will get new text . Regard

As a PHP developer, I'm aiming to add a new feature to my website. I need the creation of a field for inputting promotion codes during checkout. Key Requirements: - During checkout, when customers input a promotion code, an email will be automatically sent to the owner of that code. - The system should verify these codes by distinguishing if the customer got it from an affiliate. Ideal Skills and Experience: - Strong PHP skills - Experience in creating promotion code functionality - Background in e-commerce web development - Skill in integrating email functionalities - Ideally, experience with affiliate marketing related feature development. Must effectively respect performance and security considerations. Your understanding of these elements will be crucial.

I'm in need of a reliable freelancer to help me automate the daily backup of my PHP table data to an Excel sheet. The primary purpose of this task is to ensure that all the data on my PHP table is safely stored in an Excel sheet for backup purposes. The data includes important records that I can't afford to lose. The ideal freelancer for this project would have: - Proficiency in PHP and Excel VBA for automation - Experience in data storage and backup systems - Ability to ensure data integrity during the transfer - Excellent attention to detail to ensure all data is backed up correctly - Availability to set up and maintain a daily process If you have the skills and experience to complete this project efficiently and accurately, please reach out and explain ...

I'm in need of a proficient web developer to build a 5-page WordPress website that integrates payments stemming from social media marketing efforts. Bespoke features to include: - Integration of a credit card payment system from well-known platforms such as PayPal, Stripe, or Authorize.Net. I'm open to suggestions on which may suit the project best. - Seamless connection with popular social media platforms including Facebook, Instagram, and Twitter enabling a smooth payment process right within these platforms. The chosen individual or team should ideally have a clear track record of setting up WordPress sites with similar features and integrating multiple social media platforms. Please note, I am looking to launch the site within one month, therefore timely delivery i...

I require a proficient web developer, specifically experienced in PHP, for my current website. The right candidate will be adept in a variety of tasks: • Fixing Form Submission Errors: Currently, the website is experiencing form submission errors that need to be remedied. • Upgrading the User Interface: The form's user interface could use improvement, with the goal of making it more user-friendly and intuitive. • SEO Knowledge: An understanding and capability of implementing SEO best practices would be beneficial. Your proposal should outline your skills and experience with PHP, UI design, and SEO. Showcase any projects where you have resolved similar issues. Time efficiency and a detail-oriented approach will be highly valued in the chosen freelancer.

Budget: $100. We are se...involve integrating a seamless checkout process for users purchasing tickets, allowing for a quick registration and purchase flow. The required functionality includes redirecting users to an express checkout page after ticket selection, capturing essential details (Country, City, Contact number), and handling user registration in the process. Payment method listing with options like Stripe and PayPal is already developed and needs to be incorporated efficiently. This job requires expertise in front-end frameworks (React or Angular) to create a responsive, secure PWA that works flawlessly on both desktop and mobile, ensuring a dynamic user experience with robust security measures for ticket purchasing. The project starts immediately with a strict deadline by...

I am looking for an experienced financial advisor with a proven track record in implementing payment processors on websites. My business currently needs assistance in aligning with a payment processor, similar to Stripe or Paypal, to handle our transactions. The final product should be implementation and acceptance of our website by the payment processor. The ideal candidate should possess the following skills: - Extensive knowledge and experience with various payment processors - A clear understanding of the principles of high-level security in the context of online transactions - Experience with international payments - Ability to provide easy-to-understand advice on implementation I would like to confirm that none of our services fall under restricted categories like gambli...

...able to create personal accounts. This feature should be simple yet secure. - Payment and checkout system: The site should include a seamless and secure checkout process. The customer's journey from choosing a product to final payment should be hassle-free. Payment Gateway: - PayPal: Customers should be able to pay using PayPal. Your experience with PayPal integration is crucial for this project. Skills Required: - E-commerce Web Design and Development - User Interface (UI) and User Experience (UX) Design - PayPal API Integration - Knowledge of secure account creation and user login systems I'm looking for a professional with a proven record in e-commerce website creation. A portfolio showcasing similar projects will be highly appreciated. I r...

I'm in need of a developer to help me transform the tables on my web platform into a downloadable Exce...the Excel sheet maintains the same order and all data fields as seen on our website. Job requirements: - Extract all data fields from our websites data tables - Develop a downloadable Excel sheet functionality for each table - Ensure the data maintains the same order as on the website - Use PHP and Javascript languages Key details: - Users are expected to download updates on-demand - The Excel sheet should be styled to match the website's design I'm looking for a developer who is proficient in both PHP and Javascript and has prior experience working with similar data transformation projects. Attention to detail and ability to follow exact design specifi...

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

I require a custom-built SaaS application allowing users to subscribe, access pre-built templates, and generate content using AI tools for text and image creation. The platform will feature three user levels: user, admin, and superadmin, with functionalities including subscription plans, Stripe/PayPal payment integration, admin panel for template management, multilingual support, and AI training capabilities. The application will be dynamic and 100% owned source code without reliance on third-party scripts.

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide : Simply put, it means

We are a purchasing... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide :

...in the following areas: - Mobile application development: The core of this project is the creation of an app designed to monitor and incentivize sobriety. It should feature daily sobriety tracking, reminders and notifications, progress reports and the ability to set personal goals. - Payment integration and reward systems: The app will reward users with an in-app currency, cryptocurrency, and PayPal funds. Knowledge of integrating these payment systems is essential. It should be user-friendly, trustworthy, and secure, ensuring that users are incentivized for each day they remain sober. - Community forum development: To enhance the support system, the app needs a community forum where users can share experiences, challenges, and successes. The developer should have experience b...

...kingspointinsider.com. Key Requirements: - User Registration & Login: The Registration and User page should be set up in a modern and minimalistic design. - PayPal Donation Page: We need a simple and secure fixed donation system in place, allowing users to donate from $5.00 to $100.00. - Blog Page: Another key requirement is the creation of a Blog Page for users to engage with the site. - General Site Clean-Up: The entire website needs an overall clean up to ensure it's running smoothly and efficiently. Skills and Experience: - Proficiency in web development, particularly in PHP, HTML, and CSS. - Experience in integrating secure payment gateways, like PayPal. - Ability to design user-friendly and aesthetically pleasing interfaces. - Strong communicati...

...developer to update my PHP website's code from version 5.4 to 8.2 and migrate the existing MySQL 5.5 database to MariaDB 10.11. Key requirements: - Code Change: The project involves updating the PHP codebase, ensuring compatibility with PHP 8.2. Your role will include identifying and applying necessary changes for syntax updates, security patches, and performance optimization. - Database Migration: You'll also be responsible for migrating the database from MySQL 5.5 to MariaDB 10.11. This includes ensuring data integrity and minimizing downtime during the transition. - Framework Experience: The PHP codebase uses the Zend framework. Familiarity with this framework is essential for completing the code updates effectively. - Automation Rector: K...

Hello, this side Hema. Hope you are well. I have a voice recording project native Dutch ( standard accent) for Netherland, Belgium and Suriname people. * one time project * 1000 sentence ( sentence making according to word) * biweekly payment * PayPal, freelancer, Upwork, bank. * payment is good # note Freshers , individual, and team all welcome. If you have team or you arrange people i will give you 5$ bonus extra. Thank you

We are a purchasing... Any product can be purchased, except for those prohibited from consignment at the bottom of the shopping guide page. After the person who takes on the task receives the order, I will provide the shopping guide with the specific operating steps And send him the website address. After the recipient places an order on my website (all payments are made through PayPal, and there is no logistics record to apply for a refund through PayPal. If you have cooperated multiple times, you will know my trust level), and then based on the order amount, I will post a task on Freelancer. The amount of the order task is 20% (Excluding shipping costs)of the order amount, and the completion deadline is 30 days. shopping guide :

I'm struggling to deal with a recurring error on my macOS system that reads 'Command CodeSign failed with a nonzero exit code'. This needs resolving as soon as possible. - The specific issue pertains to the CodeSign command, which seems to fail consistently. I am unsure of what triggers it. - An important detail is that the coding language of the project is unknown. This raises the need for a proficient freelancer with broad expertise across coding languages to handle this task. - The operating system in use is macOS, so strong knowledge in this system is required for trouble-shooting. - I am facing time constraints and thus, I need someone who can get started immediately to fast-track the resolution process. IDEAL SKILLS AND EXPERIENCE: - Prolific in a variety of p...

I'm looking for a website developer to create an e-commerce website. This will involve integrating payment systems including PayPal, Stripe, and credit card processing. The site needs to be capable of managing more than 100 products and categories. Ideal Skills: - Proficiency in e-commerce website development - Experience with integrating payment gateways, especially PayPal and Stripe - Ability to manage large inventories on websites Please let me know your experience with these requirements when you bid. I'm looking for a professional who can deliver a high-quality, easy-to-navigate e-commerce site.

I'm urgently in need of an expert PHP developer to create an API for a user app. The specifics of the data handled by the API goes undefined, thus a broad skillset is valuable. Here are some keystones: - Develop API in PHP language - Good understanding of API development is crucial - Ability to work under strict timelines - Experience in developing complex APIs is key - Flexibility in dealing with unspecified data types Your swift action towards this project is highly appreciated. Let's get in touch!

I am seeking a PHP developer to create a secure CURL script that logs into a remote FTP server using a username, password, and PEM certificate to upload a file, list files and download a file. You will need to: - Set up the CURL script to handle both username, password, and a PEM certificate. - Ensure that the script successfully authenticates with the FTP server using these credentials. - Offer 4 functions (connect, upload, list, download) - Implement error handling and logging to deal with any issues that may arise during the authentication process. A well-documented and clean codebase is appreciated.