Add ABA account number assert

[acostalima]

Add ABA account number assert.

The number of digits in a Bank of America account number can vary depending on the type of account. Typically, account numbers for personal checking and savings accounts have between 8 and 12 digits. Business accounts may have a different number of digits.

Chase bank account numbers typically consist of eight to 12 digits, but some account numbers could even contain up to 17 digits.

Plaid: https://plaid.com/resources/banking/account-numbers-explained/#what-is-an-account-number

An account number is a unique string of numbers, letters, and other characters that identify a specific financial account. Almost all financial transactions make use of account numbers.

In the United States, each bank assigns account numbers using its own methodology, kept private for security reasons. Most bank account numbers have between 8 and 12 digits, though they can range from 5 to 17.

[arop]

Are we sure about the minimum limit? It seems at ach gateway we're letting min=1...
Can we double check production's db for account number minimum number of digits before deploying this?

[acostalima]

I'll double check.

[acostalima]

Based on the information I've read on Plaid's website, I've updated the regexp range from 5 to 17 characters where each character can be:

• a digit
• a lowercase letter
• an uppercase letter

[arop]

Also, we don't seem to be validating the digit-only part. Both ach gateway and backend seem to allow letters, are we sure about this one?

[acostalima]

I'll double check.

[acostalima]

Based on the information I've read on Plaid's website, I've updated the regexp range from 5 to 17 characters where each character can be:

• a digit
• a lowercase letter
• an uppercase letter

[jcm300]

See @arop comments.