Retailers Checkout Flow
The checkout process depends on specific retailer integration. There are several types of them. You can check what flow supported for which retailer in the table here.
Via user credentials
your app asks the user for their credentials
your app passes user's credentials and store items to transfer endpoint
result: items are added to cart on retailer's site
Via oauth token
your app receives user's token via oAuth flow (details are here)
your app passes token and store items to transfer endpoint
result: items are added to cart on retailer's site
Via landing url
your app passes raw items to transfer endpoint
result: transfer endpoint returns url to the store. user need to open this url to complete checkout
Retailers group
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