Amex 18-digit reference number available?

InnovAsian Expensify Customer Posts: 20 Expensify Newcomer
edited November 2018 in Integrations and API

I download the Amex detail transactions from the Amex website. It contains a field labeled "Reference" which has unique 18-digit numbers that are similar to "320182980070xxxxxx".

When I use the API template for expense downloading, I have looked at all the fields. The "expense.transactionID" does contain 17-digit numbers in the format "33482920794xxxxxx".

While these numbers look very similar, they are not the same. I am trying to do my own external reconcile of the Amex to Expenses. I lack a common field, such as the transaction number.

Are you storing the Amex 18-digit number in Expensify? Is it accessible via the API?