It seems like you might be experiencing a common issue with Facebook's Purchase event tracking. The Purchase event may be triggering on Facebook when users click the "Pay now" button, even if the transaction is not completed on your store. This can l...

We had the same problem. ARN Expected by Shopify is Partner event source ARN. Format should be: arn:aws:events:us-west-2::event-source/aws.partner/shopify.com/111111111/shopify-bus