If you are still wanting somebody else to do it for you, then you can look at hiring somebody from the Wix Arena, we can’t give you a price as it will be up to the person you might choose.
https://www.wix.com/arena/web-designers/1
However, as for the issue you have got, it is the code on your 25 hour page that is still wrong.
You need the import lines to be at the top and not added in the middle of your code.
Then you should have an onReady function for your page and then the rest of the code.
You can have code for your page before the page onReady function, however note that this will be running before the page is ready.
If you look at this well laid out tutorial it will walk you through the process of using Wix Pay to create a payment and what code to put on your page (client-side/frontend) and what code to put in the backend jsw file/s
https://support.wix.com/en/article/corvid-tutorial-processing-payments
You can also look at this tutorial here which will give you an already made up page in your own Wix Editor with the page all setup and the code all added, you can even watch the video which will talk you through it too.
https://www.wix.com/corvid/example/collect-payments-for-a-single-product