The vendor is required to complete and submit a VENDOR REGISTRATION FORM as shown in Attachment C of this policy in response to a County IFB, RFP, SOQ or RFQ. PARTIES: The parties to this contract are.(Seller) and. (Buyer). How do I become a Bexar County Vendor? Visit the Bexar County Purchasing Website and go to the Supplier Portal Registration and follow the steps listed. The AgriLife Contract Office can prepare and provide you with an applicable services agreement for the vendor's signature. Under Business Personal Property Forms, select Personal Property Rendition. How do I fill out the rendition form? In the private ordering context, there are three basic theories of obligation: • Contract,. • Promissory Estoppel, and.