Vendor Registration. There are different types of vendors doing business with the Commonwealth.Know about: Information required before drafting the agreement; Essential clauses that need to be covered in an ecommerce vendor agreement. The agreement contains conditions that the vendor should satisfy in performing a transaction. Here at Enterslice, you can get Vendor Agreement Format. Section 1 is "Vendor Identification". Type in the Employer Identification Number (EIN) OR your personal Social Security Number (SSN). J) ALL INVOICES MUST BE SUBMITTED WITHIN 30-DAYS OF COMPLETING WORK. By signing below I acknowledging receipt and agreement to the above terms and conditions. Can I use the Internet to bid?