Merchants have to comply with a certain number of rules in accordance with Card Associations.
MasterCard offers great training material and online resources covering this topic:
MasterCard Online Resources: Knowledge DataBase to understand and improve competencies in Risk and Fraud Mitigation: http://globalrisk.mastercard.com/online-resources/
MasterCard E-learning Platform: Learn more about the MasterCard rules and standards as well as their monitoring programs (BRAM, MOST, ECP, GMAP, QMAP...): http://www.mastercard.com/elearning/
MasterCard Security Rules and Procedure - Merchant Edition: Full Manual of the MasterCard Rules and Procedure for merchants is available online at: https://www.mastercard.us/content/dam/mccom/en-us/documents/SPME-manual-February2015.pdf
Visa rules are also available online:
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