Modify Sourcecode

I am programming a Taxi service app NOT like UBER but I don’t know what lines of Sourcecode I can use if someone can help me with this information (there is an application like this called INDRIVER) only that I am doing it differently, the only thing I need and I have not been able to scheduling is the travel price auction functionality, thank you and sorry for the inconvenience. ¨ be auction type (the client establishes the price he wants to pay for his trip and will receive several proposals from drivers willing to accept, increase or reject the trip, then the passenger will decide whether to accept the driver’s proposal).