Updating Fluxstore Flutter App

Job ID: 33463813

Budget: $10 – $30 USD

Tasks to be done:
YOU SHOULD KNOW FLUXSTORE, IF YOU DON’T KNOW THEN DON’T WASTE MY TIME AND YOURS AND BID
I need to update and modify some tasks in my Flutter mobile app (iOS & Android) for my eCommerce website using Fluxstore Multi-Vendor Flutter App

(https://codecanyon.net/item/fluxstore-multi-vendor-flutter-ecommerce-full-app/25013325?gclid=Cj0KCQjwjN-SBhCkARIsACsrBz7_4maYSnyq4CHAGMx6P71l7Z2UjebvVH2wqFTbRjNtFH8RIwyG6V4aAl-9EALw_wcB)

1- Integrate Telr Payment Gateway API: https://telr.com/support/article-categories/developers/
2- Integrate PostPay Payment Gateway: https://docs.postpay.io/v1/#overview
3- Improve the checkout process. Currently, During Checkout after filling in the customer information and address, it goes to the next tab which is Shipping, where the customer selects the shipping cost and clicks Next, Here we need to Auto-select the shipping option, and Hide this Tab so the customer will go directly to the Preview Tab and Shipping cost will be showing in the PREVIEW tab.
4- Fix the Stores (Brands) Screen to show all active vendors sorted (A-Z), currently are not appearing all vendors and have an issue showing vendors
5- I want to be able to add and remove currencies from using the JSON file
6- Publish the App to Google Play and Apple Store
Related categories: PHP WordPress WooCommerce JSON Flutter