The first thing you should know is that there are a series of what are called interchange levels which affect the cost of a charge at every stage, depending on a number of factors—including the type of card presented, specific information contained in the transaction and how/when the transaction is processed.
Here are tips on how you can prevent being assessed higher processing fees:
1. Swipe the card, key-entered transactions are charged higher rates
2. Obtain a valid authorization from the terminal/register
3. Provide all original electronic authorization information at the time of settlement
4. Settle transactions daily (more…)