Since the upgrade from Shopify v.1 to Shopify v.2, there has been an increase in pricing per transaction.
Shopify charges 0.3% per transaction. This is visible in your Wallee invoice as "Shopify Turnover Fee".
Our system calculates how much revenue you had, based on Shopify transactions, and charges you 0.3%.
An overview of these turnovers can be found under: Invoice > Periods > Report
More Information on our Landing Page : https://en.wallee.com/info/wallee-payments-for-shopify