Thank you for your enquiry.
There are two possible reasons for this:
1. You have not configured your connectors with Payment Completion as Deferred.
2. You have created a Shopify integration in wallee but have not installed it. This is required if you wish to use deferred payment completion.
If you continue to face issues, do not hesitate to contact us at firstname.lastname@example.org and provide your wallee account or space ID.