My App is allowed receive payment without using Billing API?

Retired Boards Appdev Billing
1

Lets imagine, i got an APP that charges the user everytime it make a sell.

I’m obliged to use Billing API to charge him or can i charge him directly?

I’ve read all policies and stuff, not quite sure if this is allowed.

Thanks in advance.

2

I found the awnser:

https://help.shopify.com/en/api/guides/charging-for-your-app/faq

Sorry for this post.