Flutter / Dart Magento 2 App Customization

***** Must Have Good Knowledge in Magento 2 Development ***** The Source Code Named : Fluxstore Pro Source Code Documentation : [login to view URL] Magento 2 Store : Up And Running ( Live ) App Source Code ( Fluxstore ) : In Original State and Non Modified yet We want to customize this app ( Fluxstore ) for magento 2 as the following : - We want it to show the checkout process as a web-view so it would support all Custom shipping and payment extensions we have in magento to save much development time , or the alternatively is to customize it to support following magento extensions : - payfort CC payment ( They have Magento 2 extension installed and they have APIs if need to integrate directly with app ) - Awebia advanced shipping extensions which generates shipping methods based on conditions , already have its extension on magento up and running . - Hide Payment methods based on conditions as per this extension which is already used : [login to view URL] - Show the "City" in the Billing and shipping addresses as drop-down to select from options , as per this magento extension which is already installed : [login to view URL] - Fluxstore have a support package so they can help fixing any bugs in the basic app , but any bugs related to our customizations should be done be the freelancer since they dont cover that in their support . - the source-code will be uploaded to a private github so the freelancer could work on it there to track things easily. Regards