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The document that serves as the basic account or service authorization for financial services is the signature card. A signature card is a crucial piece of documentation used by financial institutions that captures the authorized signatures of individuals permitted to transact on an account. It establishes a legal basis for accessing and managing the account, as it confirms the identities of account holders and their authorization to sign on behalf of the account.

This card is used by the bank to verify signatures on checks and transactions, ensuring that only authorized individuals can conduct business on that account. While account resolutions and service agreements outline the terms of use and services provided, they do not specifically represent the authorization of signatures by account holders in the same way as a signature card does. The credit agreement pertains to loan terms and conditions, which is also distinct from account authorization.