https://plygrnd.net/tags/off-topic/ Recent content in Off-Topic on plygrnd Hugo en-us Mon, 25 Nov 2024 00:00:00 +0000 https://plygrnd.net/credit-card-number-hyperfixation-notes/ Mon, 25 Nov 2024 00:00:00 +0000 https://plygrnd.net/credit-card-number-hyperfixation-notes/ <h2 id="why-are-amex-card-numbers-shorter">Why are AmEx card numbers shorter?</h2> <p>Amex is its own payment network. Most card numbers are 16 digits because they&rsquo;re issued either by Visa or Mastercard — both of which decided on 16 digit numbers for most cards.</p> <p>Amex has far fewer customers than Visa and Mastercard, so they can get away with shorter numbers; changing the number format would also be a HUGE, complicated operation.</p> <p>Want more info? Read on!</p>