Vendors must have an account in the iSupplier Vendor Portal to receive EFT payments. Bank letterhead; Account number; Routing number; Business name.The banking instructions must include: a. Table 2 – Reserve Bank and Serial Number Relationship. Reserve Bank. Letter. Designation. Number. Designation. Did you receive a letter from the Illinois Department Of Revenue asking you to verify your identity? This form is used to specify required information regarding payments from the City of. Simply go online to check your balance, transfer money, pay bills, view your latest transactions, change to eStatements, and more. Account numbers must be visible. Fill out this form and see the difference.