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Documentation Index

Fetch the complete documentation index at: https://docs.onsi.com/llms.txt

Use this file to discover all available pages before exploring further.

February 2026
Unsetting Bank Details & CSV V2

Unsetting Bank Details 🏦

Partners can now remove a member’s existing bank details via the API.

APIs

  • Update Member - Set accountDetails to null to unset bank details
  • Replace Member - Set accountDetails to null to unset bank details
  • Batch Job - Set accountDetails to null on Replace or Update operations to unset bank details

CSV Upload V2 🆕

A new version of the CSV member upload endpoint is now available. It behaves identically to V1 with one key change: when bank detail columns are present but empty for a member that already has bank details on their profile, those bank details will be removed. In V1, empty bank detail columns are ignored and existing bank details are preserved.

APIs

July 2025
Pay Cycle APIs

Pay Cycle APIs 🆕

Due to popular demand, we’ve introduced APIs to view Pay Cycles and their deductions via the Onsi API.

APIs

The documentation for the recommended processing of Pay Cycle deductions can be found here.
December 2024
Member Replace API

Member Replace API 🆕

Introduced the ability to replace member data entirely, simplifying member updates for partners.

APIs

Benefits

This new endpoint allows for easier program updates, as you don’t need to compare the current member state to the desired state to decide what changes to make. Simply provide the entire desired member state.
May 2024
Idempotency Support

Idempotency Support 🔄

Added comprehensive idempotency support to ensure reliable API operations and prevent duplicate processing.

Features

  • Idempotency documentation with implementation guidance
  • Support for x-idempotency-key header across all mutation endpoints
  • 7-day key retention for reliable retry handling
March 2024
API Launch

API Launch 🎉

We’re excited to announce the launch of the Onsi API! This initial release provides the foundation for partners to integrate with Onsi’s platform programmatically.