Validates whether a consumer has entered a valid ABA/routing number or card number. Use this endpoint when you want to validate payment method information before collecting additional details (e.g., in an IVR flow).</br></br>ACH routing numbers are validated using a table lookup against the Federal Reserve's database of valid routing numbers. Credit and debit cards are validated using the Luhn checksum algorithm. Submit only one of <code>payment_method_ach_aba_pii</code> or <code>payment_method_card_number_pii</code> per request.