Download Visa and MasterCard critical bulletins (PDF) UPDATED March 2015
MasterCard EMV Guiding Principles for Acquirers – even though not directed at merchants, very insightful
MasterCard Acceptance Rules updated December 2014. See all MasterCard Rules
MasterCard Chargeback Guide October 2014
Visa Core Rules and Visa Product and Service Rules – October 2014
Part of Visa International Operating Guidelines. Over 800 pages of information including comprehensive dispute and chargeback information for merchants.
First Data Integrated Partner Solutions EMV certified list Certified and Capable are different- check the list!
American Express Merchant Policy Guide (link to site)
Discover Merchant site
Visa comprehensive download library (official site) includes:
E-Commerce Merchants’ Guide to Risk Management PDF | 1.7mb