Hi @Anonymous, Please review the following two documentation links, I hope these will help you out.
I have done this to my store and it is sucessfully installed
may i know which theme you are using
You can find videos on youtube or else contact me
I want to know
1. What do I need to do if I want to connect paypal credit card quick payment
2. Do you need to upgrade the store package
3. After access, whether the payment results can be synchronized to the backstage of Shopify in time