Information about the types of contracts available with the City of Philadelphia. Completing and signing this form is Step 1 of the vendor registration process.Build contract is a legal document and project delivery system often used in construction. Click here to learn how they work and their benefits. The steps below outline the contracting and payment process for limited engagement service providers. All Bidders must use the City's standard bid bond form, which is included in the Bid Solicitation or otherwise available at the City's. Agencies participating in the SPA program will select certified vendors from the SPA online vendor database and contact vendors directly to solicit a quotation.