5 Signs You're Losing Money to Hidden Credit Card Fees | Entrepreneur
Briefly

Businesses must ensure their credit card processors are transparent about their fees, as hidden costs can significantly harm profits. If fees exceed reasonable limits, reevaluation is necessary.
A discount rate exceeding five basis points or a lack of clarity on processing fees is a clear indicator that your current processor may not be acting in your best interests.
You can evaluate your credit card processing costs simply by calculating your effective rate; if it's above 2.5%, significant savings may be available by switching providers.
Interchange fees should be fully disclosed by processors. If your processor fails to provide a breakdown or tries to add markups, it's a sign they might be overcharging you.
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