generated: '2026-07-18'
method: searched
source: https://pay1st-docs.carry1st.com/reference/gateway-migration-guide
scheme: uri-path-version
current_version: v4.0
entries:
- version: v4.0
  breaking: true
  highlights:
  - Major version of the Pay1st Gateway integration with breaking changes vs v3.x.
  - Existing Pay1st Users migrate to Partner Users; Administrator and Read-Only roles carried over.
  - Product and Product Bundles are no longer managed server-side; products are specified inline on Create Payment Request.
  - Summary Webhooks replaced by Payment Webhook Events; externalReference to partnerReference, playerId to customerId, amount to orderAmount (no longer in cents).
  - Old Basic Auth Token/Username/Password credentials are shredded and replaced by API Key/Secret + Signing Key.
  - Both old and new integrations can run in parallel until the old one is decommissioned.
- version: v3.1
  breaking: false
  highlights:
  - Prior documented Gateway version.
- version: v3.0
  breaking: false
  highlights:
  - Earlier documented Gateway version.
notes: >-
  Carry1st publishes no dated, entry-by-entry changelog; version history is captured from the
  Gateway Migration Guide and the versioned documentation paths (v3.0, v3.1, v4.0).