Basic Order Taking App

we are looking forward for a basic order taking app for vegetables. An android app which can be downloaded from the app store. Registered no. and email id of our vendor. From where we provide list of items we supply. They can input the quantity of the products and place the order. Same is confirmed to given mail and number. At admin end we get the purchase order copy which we can edit to and send to the procurment people. Who would procure and revert us on final procured goods and send us proof of delivery. Than the admin panel can raise the bill and send to the mail and update on RMN. and also update the bill against the purchase order. Payment reminder is given if unpaid and paid de markation is done.