Optional, but must be supplied together with PaymentMethod. Format depends on PaymentMethod. bank: RoutingNumber-AccountNumber for a US bank account (routing number left-padded to 9 digits); InstitutionNumber-TransitNumber-AccountNumber for a Canadian bank account (padded to 3 and 5 digits); or an IBAN (spaces are removed; the checksum is validated). Any other number of '-' separated parts is rejected, so the account number must not contain '-'. email, paypal, venmo, zelle: a single value; if it contains '@' it is used as the email address, otherwise as the phone number (digits only, up to 13; PayPal and Venmo phone numbers must be complete). For paypal, venmo and zelle the contact's name (BusinessName, or FirstName LastName) becomes the recipient name; it may contain only letters (English and French accented), digits, spaces and the characters = $ ( ) . * - ' / and must be fewer than 100 characters.