Resolves and verifies a recipient's account with the destination
institution before you add them as an external account. Use it to
confirm the account holder's name and that the account is reachable, so
you can show the resolved name and avoid failed transfers.

Pass at least one identifier: account_number, iban, phone, or
clabe. The service detects the account type, validates its format,
then resolves the name with the institution.

• is_verified: true — the account resolved. account_name holds
  the confirmed holder name.
• is_verified: false — the account could not be resolved. Any
  institutions that matched the identifier are returned in
  institutions so the user can pick one and retry.

Verification is supported for bank accounts and mobile money today.
Other types (IBAN, SWIFT) return is_verified: false.