If you are using a Partner Development Store plan, the app may warn it will be setting up charges - but these will only be test charges and no actual charge will be made.
If you are using a Basic, Shopify, Advanced or Shopify Plus plan, the charges will be legitimate and will be added to the monthly Shopify Account charge, as listed in the information below:
Please note - you must be using a 'Development Store' to qualify for the unlimited free trial. Any merchants using the Basic, Shopify, Advanced, or Shopify Plus plans will receive a 30 day free trial, and charges will begin after this date.
All of our app payments are handled directly through Shopify - if you'd like to change your payment details for your recurring charges, you can handle this directly through your Shopify admin.