Register Online to Become a Vendor. To do business with Allegheny County, prospective vendors must register with Bonfire, the online bid management system.The PA Business One-Stop Shop Help Center was created to assist businesses and entrepreneurs to start, operate, and grow a business in Pennsylvania. You will be required to start the registration process in the VendorStat Application. The standard purchasing process for Allegheny County involves: requisitioning; public solicitation; bid and proposal receipt; evaluation and contract award. We'll help you craft the best vendor contract agreement for your specific needs, and help you manage that relationship as long as you need it. Thank you for your interest in serving the needs of the ATI Companies. ➢ Please review and complete this form, sign, scan and save to your computer for your. Establish clear terms and conditions with vendors using our vendor agreement template. Create your agreement!