Get Agent Customer Me
Agent
Get Agent Customer Me
Return the customer the agt_ token belongs to.
Tenant scope: the agt_ token already carries customer_id and
merchant_id; we still verify the customer’s merchant_id
matches the caller’s resolved merchant in case of an unexpected
cross-tenant FK (defense in depth — this should be impossible
given the model constraints, but the assertion is cheap).
GET
Get Agent Customer Me
Response
Successful Response