Thanks for reaching out.
I appreciate that you have added a screenshot of the error you have received. Just to gather some additional context, do you have an active Shopify plan on your store?
In order to complete purchases within your store checkout, you're store must have an active Shopify subscription plan. You can still place a test order by enabling Shopify Payments test mode by navigating to Settings > Payments > Mange and scrolling to the bottom of the page to see the checkbox to enable test mode.
We do have a list of requirements for the use of the Shopify Payments gateway, feel more than welcome to give it a read through.
Looking forward to your response.
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