Is there an API that would let me access my AMEX transactions? How do Mint or any other finance websites export my data? If so, is it free?
This API was created by American Express. The Amex Card Application Offers API endpoint is located at https://api.qasb.americanexpress.com/acquisition/digital/v1/applications/card_accounts/target_offers.
Once you've chosen an American Express statement, select the download icon and choose a file format to save the document to your computer or mobile device. You can download American Express statements as a PDF, Excel, CSV or Quicken file.
The most common reason for a card to be declined is because you're over your credit limit, or the purchase in question would put you over your credit limit. While some issuers either don't have a set credit limit or let you charge above it for a fee, many issuers use your limit as a hard stop for purchasing power.
American Express, also known as Amex, is a global services company that offers a payment gateway (American Express Payment Gateway) as well as world-class Credit Cards.
Take a look at open financial exchange.
American Express appears to support this.
Mint uses the services of Yodlee (see here), a firm that essentially acts as middleware between banks and companies like Mint.
You might be interested in Yodlee's Account Data Gathering API but it looks like it is something that requires a formal agreement, and access to the API probably needs to be paid for..
MasterCard are also looking at releasing an API (see here) so maybe AMEX will follow suit?
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