How to make a payment gateway?

Hi @irshad.sabik18gfy , welcome to Thunkable! :tada:

Be sure to check out our posts about How to ask Great Questions v2.0 and our Community Guidelines as you get started.

You can find more information about In-App Purchase Blocks with RevenueCat here: In-App Purchase Blocks (with RevenueCat) - Thunkable Docs

And we have some other posts using Stripe and Paypal:
Understanding Stripe API (App demo link below) - Tutorials and DIY Guides - Community (thunkable.com)

How to Intrgarted PayPal Payment Gateway | Step By Step - Tutorials and DIY Guides - Community (thunkable.com)