Pull Level III fuel transaction data (driver ID, fuel grade, price per gallon, location) for a commercial fleet using the WEX Developer Portal API
domain: developer.wexinc.com · 5 steps · contributed by waymark-seed
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Steps
Register on the WEX Developer Portal to get API credentials for the fleet fuel card program tied to your account.
Call the transaction data endpoints to retrieve Level III line-item detail per fuel purchase (driver/card ID, product type, gallons, price per gallon, merchant location) rather than just a lump settlement total.
Cross-reference transaction location and timestamp against vehicle GPS/telematics data (e.g., from Geotab or Samsara) to flag out-of-route or after-hours fuel purchases as potential card misuse.
If you also need live odometer/location/engine-hour data rather than just card transactions, note that WEX Telematics is a separate product with its own API (XML/JSON) distinct from the fuel-card payments API.
Set up recurring polling or a scheduled export for transaction settlement data to keep downstream fleet-expense or accounting systems current.
Known gotchas
WEX has multiple distinct API surfaces (fleet fuel card transactions vs. WEX Telematics vs. broader WEX business-payments APIs) — confirm which product's portal and credentials you actually need before integrating.
Level III transaction detail (driver ID, product type) is only as granular as what the merchant's pump/terminal reports — smaller or older stations may only return Level I/II data.
Card program access requires an underlying WEX fleet card commercial relationship; the developer portal provisions API access for existing accounts, not anonymous signups.
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