Merchant API v1beta was discontinued and shut down on February 28, 2026. For steps to transition to the latest stable version, see Migrate from v1beta to v1.

ForwardMcpMessage

ForwardMcpMessage
`rpc ForwardMcpMessage( HttpBody ) returns ( HttpBody )` The ForwardMcpMessage message is for the old implementation of the MCP that acts like a proxy between the MAPI server and the GCP infrastructure. The other QueryMapiDocs and FindMapiCodeSample methods are equivalent but using OneMCP. Authorization scopes Requires the following OAuth scope: `https://www.googleapis.com/auth/content` For more information, see the OAuth 2.0 Overview .

rpc ForwardMcpMessage( HttpBody ) returns ( HttpBody )

The ForwardMcpMessage message is for the old implementation of the MCP that acts like a proxy between the MAPI server and the GCP infrastructure. The other QueryMapiDocs and FindMapiCodeSample methods are equivalent but using OneMCP.

Authorization scopes

Requires the following OAuth scope:

https://www.googleapis.com/auth/content

For more information, see the OAuth 2.0 Overview .

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Last updated 2026-07-01 UTC.

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ForwardMcpMessage