All businesses that want to contract with the City must register with iSupplier, to receive bid notifications, to apply for local business certification. What is An Assignment Agreement?To participate in the RFQ process, you must be fully registered with iSupplier. Here is information on Selling to the City of Oakland. Understanding the seller's objections and how to respond is crucial to obtaining the assignment contract. Making the Initial Offer. Once you get to the iSupplier Portal, click on the Government Tab. My ultimate purchase and sale agreement designed exclusively for wholesalers and break it down for you. Potential suppliers, contractors, and service providers can complete the Port's Supplier Application Form to register to do business with the Port. They shall not form part of the Contract nor have any contractual force.