[JaggedJax]

Their terms seem a little unclear to me, but it seems that they claim they are due a percentage of anything you charge a customer who uses your Shopify app, even if you don't bill extra for use of that app.

However in practice I have found Shopify not too strict about fees charged outside of Shopify. I suppose if you were actually charging your customers specifically for the app but doing it outside Shopify to avoid the cut they would come after you.

I find BigCommerce a worse offender here. They copied Shopify's terms and constantly hound you asking for a cut of money even if you offer a free plugin with your standard service. Their method of collecting this info is also arcane, manual, and threatening. I would drop BigCommerce support in a second if they challenged us on this. So far they have backed down when we tell them we don't charge extra specifically for BigCommerce. But they still hound us monthly to submit a $0 report.