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Trustly API Python Client implementation
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Trustly Python Client

This is an example implementation of communication with the Trustly API using Python. It implements the standard Payments API as well as gives stubs for executing calls against the API used by the backoffice.

For full documentation on the Trustly API internals visit our developer website: . All information about software flows and call patters can be found on that site. The documentation within this code will only cover the code itself, not how you use the Trustly API.

This code is provided as-is, use it as inspiration, reference or drop it directly into your own project and use it.

If you find problem in the code or want to extend it feel free to fork it and send us a pull request.

This code is written for python 2.7.


The code provided wrappers for calling the trustly API. Create an instance of the API call with you merchant criterias and use the stubs in that class for calling the API. The API will default to communicate with, override the host parameter for the constructor to comminicate with instead.

When processing an incoming notification the handle_notification() method of the API will help with parsing and verifying the message signature, use notification_response() to build a proper response object

The examples below represent a very basic usage of the calls. A minimum of error handling around this code would be to check for the following exceptions during processing.

  • TrustlyConnectionError

    Thrown when unable to communicate with the Trustly API. This can be due to Internet or other forms of service errors.

  • TrustlyDataError

    Thrown upon various problems with the API returned data. For instance when a responding message contains a different UUID then the sent message or when the response structure is incomplete.

  • TrustlySignatureError

    Issued when the authenticity of messages cannot be verified. If ever this exception is caught the data in the communication should be voided as it can be a forgery.

Example deposit call

import trustly.api.signed

api = trustly.api.signed.SignedAPI(merchant_privatekeyfile='/opt/application/private.pem',
        username='username', password='password')

deposit = api.deposit(


Example notification processing

# FIXME Handle the incoming notification data here
notifyresponse=api.notification_response(request, True)

# Write json response to the output stream for the web server
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