Are there are transaction charges that we need to pay to StoreHippo or Payment gateway providers?

StoreHippo does not take any transaction charges. However, the transaction charges or TDR's are deducted by the respective payment gateways. StoreHippo has a tie up with the leading payment gateways across the globe, you can see the list of payment gateways and their TDR's here: PaymentGateways