> For the complete documentation index, see [llms.txt](https://dev.payon.com.kh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.payon.com.kh/how-to-implement/how-to-implement-qr-payment/web-base-implementation/step-4-notify-completion-payment.md).

# Step 4: Notify Completion Payment

This step  to notify the completion of payment. 3rd party mobile app need to call this end point to notify payment result to PAYON's aggregator.

![Figure 4.1 PG Payment Succeed Screen](https://3248127681-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfVqIgxK8Sk7FYmeRNmqq%2Fuploads%2Fx1GzvORK5NDB6e0dehKP%2F8.png?alt=media\&token=a9108bdd-1653-4560-985f-3042482e8e91)

![Figure 4.2 PG Payment Failed Screen](https://3248127681-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FfVqIgxK8Sk7FYmeRNmqq%2Fuploads%2FZNKWvCcWiXtIvKauoODb%2F9.png?alt=media\&token=aff3bd60-28d9-4fc1-b6ce-844f604628fe)

The final step is to notify payment result to PAYON's aggregator, Please follow [Notify Completion Payment API ](/payon-api-rerferences/qr-payment/notify-completion-payment.md)for more detail api specification.