Authentication
Authenticate server requests with a merchant API key linked to your Base54 Pay account.
Learn moreAPI Explorer
Welcome to Base54 Pay's API Explorer
Explore the public Merchant API for hosted checkout sessions, service-code invoice lines, branch cash deposits, and signed webhooks.
Versioning
Base54 Pay publishes the current public contract as a dated versioned API surface.
Learn moreResponse handling
Use stable error codes, idempotent retries, and webhooks for final payment state.
Learn moreVersions
Compare API Versions
The current Merchant API is the published integration contract. New dated versions will appear here with migration notes before breaking changes.
Version
Status
Contract
2026-06
Current
OpenAPI 3.0.3 / v1.0.0
Next
Not published
Added here before migration windows begin
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