Tokenization is the most powerful concept being used as per PCIDSS in credit cards domain to mask card number. There are two methods how tokenization works. The differences explained in audio podcast for Vault based and Vault-less methods.
Try to understand Digital wallets vs Credit or Debit cards. The wallets have lot convenient and benefits compared to carry physical cards. Read more with examples.
Popular credit card payment processors across the world awesome list
How to understand Incremental authorizations effectively. Clearly written and simple to understand way.
The very well written post to understand the differences of Card present and not present scenarios in Credit cards processing. Highly complex to understand sometimes about these scenarios. Here is a guide and helpful for learners to get more knowledge on cards domain. Read more.