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UpsertMerchantCustomAttribute
An MCP tool from the Square API server, hosted on mcp.hjlabs.in.
UpsertMerchantCustomAttribute Creates or updates a custom attribute for a merchant. Use this endpoint to set the value of a custom attribute for a specified merchant. A custom attribute is based on a custom attribute definition… [POST /v2/merchants/{merchant_id}/custom-attributes/{key}]
Name on the gateway: square_api__upsert_merchant_custom_attribute · may change things.
Parameters
| Name | Type | Description |
|---|---|---|
merchant_id required | string | The ID of the target merchant. |
key required | string | The key of the custom attribute to create or update. This… |
custom_attribute required | object | The custom attribute to create or update, with the following fields: - value.… |
idempotency_key | string | A unique identifier for this request, used to ensure idempotency. For more… |
How to call it
Through the Smart Gateway, any client can run it by name with call_tool, or let the gateway find it with search_tools:
{
"name": "square_api__upsert_merchant_custom_attribute",
"arguments": {
"merchant_id": "…",
"key": "…",
"custom_attribute": "…"
}
}Or connect the Square API server directly, which lists 308 tools including this one:
claude mcp add --transport http hj-square-api https://mcp.hjlabs.in/mcp/square-api \
--header "Authorization: Bearer YOUR_API_KEY"Try asking
Use the upsertmerchantcustomattribute tool with merchant_id set to ….