FastSpring API

Last modified December 9, 2016


Obtain your "API Key", which consists of a username and password. To obtain your API Key, login to the Dashboard and navigate to Integrations > Get API Credentials. The username and password are used for "Basic Authentication" when making requests to the API. A "User-Agent" header is also required by the API to be included in all requests.

Make all requests to

Note about creating new transactions via the API

As the merchant and seller of record for all transactions we process, only FastSpring can collect customers' payment details (e.g. credit card numbers). Thus, in order to create new transactions via the FastSpring API, the customer must already have a payment method on file with FastSpring. Read more about creating orders for customers with payment methods on file here.

Data Types

When preparing your database structure for storing values obtained from FastSpring via our JSON payloads you might assume the following datatypes:

  • All "string" columns are VARCHAR 255, accordingly trimmed
  • Encoding is UTF-8
  • For numeric values (such as price or discount values) 2dp precision is expected ("2.00")

Available API Endpoints

Rate Limiting

In order to maintain a responsive user experience, FastSpring may impose request rate limits on API calls originating from individual accounts. In the event that the rate limit is met, the response to the API request will be an http 404 response code (though this may be improved soon).

Batch requests

If you need to make a large number of API requests in a very short time, such that you may encounter rate limits, consider using batch requests where possible. For example, when retrieving authenticated account management URLs, you can obtain URLs for multiple account IDs in a single request:  

GET /accounts/{id1}[,{id2},{id3},...]/authenticate

More information about this example can be found in our Knowledge Base article about the accounts endpoint.

Similar batch functionality is available for retrieving ordersproductsreturns and subscriptions.