Flutter App development like Magicpin -- 2

Source code will be our property. Payment will not be made in advance. Payment will be made in milestones. Before making any payment, I need your residence proof and photo i.d proof. Without providing me your i.d and address proofs, don't ask me even a penny. There will be three panels. Admin panel in web Seller panel mobile app buyer panel mobile app There should be google maps api integration. There should be UPI payment system. So that when buyer make the payment, payment should come to admin, admin release the payment to seller. We are looking for an experienced Flutter developer who has already developed an eCommerce App like Magicpin. In this appp we want all features like Magicpin. We want that sellers should be able to register online on seller portal to join as a seller. After seller fill all their details, all details should come to admin for verification of all documents and details of seller. After we confirm all the details, seller should get a notification on their seller panel and registered mobile number and email i.d. Once admin gives approval to seller to seller will be able to login into their seller panel by using mobile otp or email i.d and password and list their products by uploading excel sheet or one by one. Seller should be able to decide delivery charges and enter it with all orders. If admin rejects seller details then seller will not be able to login into seller panel. If there are any documents required from seller then admin can demand such document and seller should get an option to upload that single document also in the panel. There should be options in admin panel, using those options admin should be able to select any single or any multiple documents to demand from seller or buyer. Once seller do the listings of products or discount coupons in their dashboard, those details will go live on their seller and will be visible in buyer app also. Suppose any buyer installs our app in any pincode like 110001 then app should fetch exact location of buyer and should show that address on top left in the buyer's app. After fetching buyer's location, app will show partner stores of that particular pincode to buyer on top. Buyer should be able to open any store, will click on any products available on that store, add to cart, proceed to pay and place an order. Once an order is placed, a notification will go to that merchant from which order is placed. a confirmation email and message to buyer also and all orders should be stored in admin panel in sales or order history buyer wise, seller wise, orders wise, earning wise. A notification will go to nearest delivery boy. Delivery boy will accept the order and proceed to seller and collect the order and deliver to buyer. Buyer and seller should be able to track the delivery boy on app. Once delivery boy will mark delivered then that order will be shown delivered in buyer panel, merchant panel and admin panel also. There should be an order number on each orders. Admin will click on any order and all details related to that order should open. After order is delivered marked, buyer should get an option in their dashboard to give feedback and rating on that order and seller profile. All ratings and feedbacks should be calculated number of star wise and visible on seller's profile. Any feedback can be removed by admin or buyer only. Admin should be able to download any sales report in excel format.