Hey @dennisdev. ! How are you? 😄
To validate the user payment you have to implement a webhook in your system, and then register your pix key and the webhook URL in our API.
Here are some links that may be useful:
Understanding the webhooks (with examples): https://gerencianet.github.io/documentation/docs/PIX/Endpoints#webhook
Example of how to register your pix key and the webhook URL: https://github.com/gerencianet/gn-api-sdk-typescript/blob/main/examples/pix/webhook/pixConfigWebhook.ts
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