If it doesn't, include a W-9 and most recent bank statement with this form. Vendor must submit a VOIDED check or BANK letter with completed form.No starter checks, sample checks, counter checks, or deposit tickets accepted. A bank letter is an official document from your bank that provides important information about your business' official bank account. To use the ACH Debit option, complete Sections A and B of Form EFT, Authorization Agreement for Electronic Funds Transfer. Need to change or cancel an existing enrollment? Need to change or cancel an existing enrollment? Invoice detail will be sent to the requested email address announcing the. ACH payment deposit to your bank account. Becoming a member is easier than you think.