Pls what do i need to know to receive payment with a payment gateway without making extension

Good day every, am new here. Pls i want to receive payment through a payment gate way called paystack, and i need help to know how that can be done without making an extension.

I want to make an app that contains ebooks. So when a user pays, it automatically gives the user access.
How can my app communicate with this payment gateway and automatically grant access to a user if payment is successful.

Read this:

you can use Web component

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Do you have a video sample that models this your answer?

No, i just shared how you can do this search for curl in community