Fix code of PayPal debit card payment - Sandbox

Hello guys and girls, I have been through two developers already who claimed they can do it and they failed and as I know how hard task this is as well as that the majority of you will say the same "I can do it" I do not want to waste any more time with another failure. With this being said I have uploaded the files. PayPal credentials of buyer and seller are correct. PayPall account is set to PayPal Business. If the rest of the credentials like host links to PayPal are set correctly or not - I have no idea. Download the code, fix it, make a successful transaction and the money are yours. Once you tell me you have done so I will assign you the task, check your work and you get paid. Transaction needs to be done in GBP and there is no Zipcode needed like it is in the code because as far as I know only USA has Zipcodes. Even if it is not just them UK where the sales are happening only has no zipcodes. Postcodes - yes but no zipcodes. Sort it out and let me know before someone else does. Credit card details: Credit Card Number: 4137358961228038 Expiration Date: 10/2021