I also use this 2nd tool (shown above) before accepting credit cards for Bitcoin and altcoins.........................................................................................................................Have you ever wondered what the information on a credit card actually means?
Please see Part 1 for more thorough details and my 1st pick for credit card validator -
Here is the link to Part 1 -
https://steemit.com/bitcoin/@nandibear/free-online-credit-card-validator-displays-hidden-information-helps-ascertain-if-the-person-using-the-card-is-the-real-owner-i
Good exposition @nandibear ,would be helpful alot,followed upvoted resteem check my posts @detycoon cheers