I am struggling with how to implement deferred purchase options (Pre-Order) in my app. Basically, I have used SellingPlan API to create and add products to Selling Plan group but when I test the checkout process it still doesn't delay the payment to a fixed date but rather pay immediately with all amount.
Basically I want to fully implement like this:
Can someone explain further what I have to do with Plan purchase and checkout task? I was following this link: https://shopify.dev/apps/purchase-options/deferred/modeling#building-deferred-purchase-options-in-yo...
But I don't understand how to implement it, do I have to create a new Liquid template file for the checkout page?
Any help would be greatly appreciated. Thanks