How do you accept online credit card payments in mobile app?

To accept credit cards on your mobile app, you would need two things:

1. You would need an SDK to be able to accept the swipe and/or manually keyed in information about the credit/debit card.

2. You would then need a payment processor to work with, or more commonly referred to as a PSP (Payment Service Provider) who would provide you with the ability to accept and process credit/debit card payments.

Examples of such PSPs are PayPal, Braintree, Balanced Payments, Stripe, etc.