These ACH Payments capabilities allow the user to electronically pay individuals or businesses. With this robust solution, you maintain control of your funds.The first step in using an ACH authorization form is to request this form from your bank or financial institution. Start with the name of your bank. Please enter the city or branch name your bank is located. Fill this form out and turn in to your employer. How to Complete this Form. 1. This letter must include ABA number (routing or transit number), bank account number and if the bank account is a checking or savings account. Use these instructions to complete the ACH Enrollment Form to receive Supplier reimbursements via direct deposit. Once your letter is completed, please return it to our office.