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GET
Download the AEAT import file
Live capability. Melso runs this in production today. Partner keys reach it once your partner account is enabled. See Availability.
It is a way to load the return into the AEAT’s form. It is not a submission and not proof of filing.

Authorizations

Authorization
string
header
required

Your partner secret key, mk_live_… for real companies or mk_test_… for test companies. Keep it on your servers. See Authentication.

Path Parameters

company_id
string<uuid>
required

The company's ID. Every company-scoped call works in exactly this company.

tax_return_id
string<uuid>
required

Response

The import file, named like 303_2026_3T.txt.

The response is of type string.