Limit generated Discover cards to 19 digits #2845
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Motivation / Background
Discover cards explicitly support up to 19-digit card numbers, and the current generators for 20-digit card numbers wind up generating invalid numbers that eg. are not correctly detected as Discover cards according to ActiveMerchant.
Additional information
Discover IIN Range Summary
Checklist
Before submitting the PR make sure the following are checked:
[Fix #issue-number]