> For the complete documentation index, see [llms.txt](https://docs.rocketfuel.inc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rocketfuel.inc/developer-guides/api-reference/payins/rocketfuel-ui-integration/payment-processing.md).

# Payment Processing

There are two ways to use payment processing:

1. Payment page
   1. After payment, the shopper will be redirected to "redirectUrl" passed during Invoice link generation.
2. Payment Widget
   1. After payment a window callback message will be sent byu our widget to update on the status of the payment