If you’re offering Shopify discounts but they aren't applying at checkout, the issue may be related to the Shopify Purchase Option setting.
Why It Happens
When the Shopify Purchase Option is enabled, the PreOrder Now app will not use the Shopify Draft Order API. This prevents Shopify automatic discounts from being applied, as they are not supported with the Draft Order API.
How to Check
Go to Settings in the PreOrder Now app.
Navigate to Default tab.
Verify if the Shopify Purchase Option is enabled.
If this option is enabled, disabling it will allow Shopify discounts to apply correctly.
