For application developers, GivingFire has a public API based on the JSON 1.0 specifications. (http://jsonapi.org/format/) Access Keys are generated on a per-organization basis for full GivingFire accounts, and can be created on the API tab of the Data Services page under Settings > Data Services > API.
You can access your API documentation by appending /api/docs to your GivingFire URL, or by visiting the link found underneath the API tab. Have any questions with integrations or new apps? Email your GivingFire Account Manager or contact us at firstname.lastname@example.org and we'll get back to you ASAP.