beel-es Company Payment Connections API
The payment provider connections of a company as a sub-resource of the company itself, addressed by `/v1/companies/{company_id}/payment-connections`. The NIF in the path is the only source of context: the account that owns it is derived from it. Opening a connection is the sibling sub-resource `…/payment-connections/authorizations`, because it returns an authorization URL and not the connection the collection lists.