---
updatedAt: 2026-07-08T09:38:23.000Z
agentTools:
projectIndex: https://doc.fintecture.com/llms.txt
---
# Update a payment
# Flow
1. Request a PIS dedicated [access token](/docs/api-request-a-pis-access-token)
2. Get the `session_id` linked to the payment you want to update
3. [Update the desired payment](https://doc.fintecture.com/reference/patchpisv2paymentsession)
🚧 Important
Signature, digest, date and x-request-id headers are optional in SANDBOX environment but mandatory when calling the PRODUCTION one.