There is no difference in pricing for our Shopify customers. You will only be charged transaction fees on purchases that flow through PayWhirl widgets or payment forms.

Any transactions that flow through the normal Shopify cart will be separate and will not be charged PayWhirl fees and visa versa. Any transactions that flow through our cart will not be charged Shopify fees.
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When purchases do flow through PayWhirl widgets, you will be charged PayWhirl transaction fees (0.50% - 3.00% depending on your plan). This is in addition to the merchant & processing fees charged by the Payment gateway you connected to PayWhirl.

Shopify does "in app-billing" for your PayWhirl Plan. If you signed up to PayWhirl by installing the app through Shopify are charged your monthly fees by your payment method on file with Shopify. 

*If you use the Stripe gateway PayWhirl transaction fees are deducted immediately when the transaction processes. They are not billed with your monthly plan.
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**If you are using Braintree or Authorize.net, your transaction fees will be added to your monthly billing along with your PayWhirl Plan.
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Please let us know if you have any questions. 

Sincerely,
The PayWhirl Team