post
https://api.demo.mondu.ai/api/v1/sellers
Registers a new seller, or updates an existing one when a seller with the same external_reference_id already exists for the authenticated merchant. The upsert key is external_reference_id; it can be set on creation but cannot be changed afterwards.
Returns 201 Created on insert and 200 OK on update — distinguish by HTTP status code, not by response body shape.
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