text: will this work for temporary payment processing solutions? i am having a lot of trouble integrating paypal pro (credit card processing) on to my website.  since my goal was to get it up and running by black friday, i am trying a simplier solution.  while i cannot check each specific card number, i will have it check to make sure that the card can be consitered a valid credit card number (then before sending i will process it myself, and if there is a problem i will e-mail for a new card).  the details on the card types that i have are:  "mastercard", starting number>>"51,52,53,54,55",  total no:"16");  "visacard" starting number>>, "4",total no: "13,16");  "amexcard" starting number>>, "34,37", total no:"15");   "dinersclubcard" starting number>>, "30,36,38",total no: "14");   "discovercard" starting number>>, "6011", total no:"16");  "enroutecard" starting number>>, "2014,2149", total no:"15");   "jcbcard" starting number>>, "3088,3096,3112,3158,3337,3528", total no:"16");   are these numbers correct? thanks ! yeah those numbers are correct. you can also use the luhn formula to then validate card numbers quickly to make sure they are at least a valid possible card number and process it manually if it passes the checks.   this should be sufficient enough for you to then process cards with a reasonable amount of certainty. just make sure the card clears before sending any goods so that you don't get stiffed with bogus cards.  i have included a few websites you can use (some of them you might have seen already).  enjoy!