Wordpress Plugin Update & Database Sync

The client is currently using a wordpress plugin to process payments and also update their database through this app here - [login to view URL] We’d like to: >>> Update a payment gateway plugin. This is being done so that once the payment goes through, the page maybe redirected to a thank you page...so that a pixel maybe add to be able to track conversions. The feature to be able to redirect to a thank you page is not available with the current plugin. >>> While updating the plugin, we will need to ensure that the database is updated...currently, enrollments are entered into the database for even credit card payments that do not go through. What will be provided: >>> Access to the site >>> Plugin >>> Access to the above app and a demo database for you to be test before going live >>> Direct access with the app’s support team (3 way call) What needs to be done: >>> Site backup while testing the updated plugin on the dummy app above >>> Ensure payments are tested first (dummy details will be provided after consulting the company above) >>> Ensure entries are made correctly in the database >>> Client offers 3-5 courses. Will have to review best option to be able to track via Google, Facebook, etc pixel placements. Please do not apply if you do not have more than 9 five star reviews. If you do, you would really have to be offering us something exceptional. Need to know: >>> How much time it would take; and >>> How much it would cost. Thanking you and looking forward to working with you.