> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.mercoa.com/embedded-ap-ar/api-reference/webhooks/counterparty-added/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.mercoa.com/_mcp/server.

# Counterparty Added

POST 

A payee-payor relationship was created

Reference: https://docs.mercoa.com/embedded-ap-ar/api-reference/webhooks/counterparty-added

## Request

### Payload

- `eventType` (string, required) — The type of the event.
- `payeeId` (list of string, required) — A list of IDs for the payees involved.
- `payorId` (list of string, required) — A list of IDs for the payors involved.
- `user` (object, optional) — User who initiated the change.
  - `id` (string, required)
  - `roles` (list of string, required)
  - `createdAt` (datetime, required)
  - `updatedAt` (datetime, required)
  - `foreignId` (string, optional) — The ID used to identify this user in your system.
  - `email` (string, optional)
  - `name` (string, optional)