gas station and convenience store application.

I need an gas station management android app for retail outlets. there is a demo website that has the basic funtionality and that you will modify and add all funtionality to create the back end. the app will be connected to the website. The web script will be hosted on cloud/server and each user shall create account. the app will be used to capture all gas station daily operation data including sales, price change, banking, products receipts including fuels, incidents, allocation of work to pump attendance. The output data include daily/monthly/annual/custom stocks reconciliations which uses the captured data. a powerful dashboard must be included to provide performance at a glance to users. The app will also send customised and automated daily perfomance reports to managers and owners of the station. low stocks, variances alerts shall be send immediately they are detected. users shall pay monthly subscription fee to use the platform and also advertisers can create campains and advertise their products such as oil, airfilters, brake fluids. etc. fuel/oil customers (gas station customers) will also create account to able to check their balances anytime. Every time they take fuel and their account is updated they receive an alert/email with the remaining balance shown. sales report should be broken down to cash and credit sales. credit should also be broken further to card, invoice, etc The app should provide for future upgrading to on-board convenience store sales. Beautiful UX/UI will be among the evaluation criteria. the app should create a good experience to users. Payment gateway intergration is a must and the gateways shall be provided to successfully candidates. candidates must provide a link to a similar gas project that they have successfully developed for my review.