Parameters for List Country Specs Request in the Specifications API.

Build this struct with new!/1 and pass it to the corresponding function on Inttegro.Specifications. Required keys are enforced immediately; optional values left as nil are omitted from the request sent to Inttegro.

Retrieves country-specific capabilities and financial institution directories.

Use specifications to populate supported-country, bank, branch, and provider choices. Treat the response as authoritative and refreshable rather than hard-coding a directory into an integration.