How do rates and interchange work for credit card processing?
For a brief tutorial about Interchange, you can access the following link produced by Visa:

• Interchange Brochure

Can I view what the base rate and fees are set at?
The Visa/MasterCard Interchange Rate Charts:

• Visa
• MasterCard

What is PCI Compliance?
Payment Card Industry Data Security Standard (PCI DSS) is critical in terms of protecting consumers from identity theft. It is a set of requirements designed to ensure that ALL companies that process, store, or transmit credit card information maintain a secure environment. PCI applies to ALL organizations or merchants regardless of size or number of transactions. To be sure that you are in compliance use the following link to perform a Self-Assessment Questionnaire (SAQ).

• PCI Security Standards