Digital Permit Book has an API you can use to connect your own systems, such as a TMS or an internal tool, to your DPB account.
API documentation
The full API reference, with every endpoint and field, is here:
Get API access
To get API credentials for your company, email support@digitalpermitbook.com with your company name and what you'd like to connect.
Using Samsara, Motive, Geotab, Platform Science, or Isaac? You don't need the API for these. Connect them in Settings > Integrations.