API Authentication

To use the Treasury Systems API you need to authenticate using JWT Bearer tokens. 

You first need to obtain a JWT token from the Identity Provider you use to log in to the system, using OAuth2/OpenId Connect. For most users (those who “Log in with Microsoft”) this is Microsoft Entra Id. 

Then you attach the JWT token by setting the “Authorization” HTTP header to “Bearer < TOKEN>”. 

Use cases

There are several ways to use the API. The approach varies depending on how you want to log in and which application you are using.

1. Excel access by Normal user
   For normal users that want to access data in Excel you authenticate as yourself.
   See Using Excel and login in with organization account
2. Automated Integrations
    This method works well with tools such as Integration Platforms (such as Logic Apps) or scripting (PowerShell, cURL, postman).

Accessing the API from scripts and integration Platforms

General steps to access the API

The steps to acquire a JWT token might depend on the IdentityProvider used and the integration platform of choice. Below you will find the general steps required:

1. Preparations (One time)
   Setup credentials to use for accessing the API.
   The exact step depends on your IdentityProvider. Please see API authentication: Register Application in Microsoft Entra Id for more info. This is commonly called an application, service identity or similar.

• After this step you will need to know 
  1. the client id and client secret for the application
  2. the identity providers token endpoint (eg. https://login.microsoftonline.com/{TENANT_ID}/oauth2/v2.0/token for Microsoft login)

1. Use the client id, client secret to obtain an JWT token using OAuth “client credentials” flow using your IdentityProvider’s token endpoint.
2. Make a call to the API with the JWT token
   1. Set the HTTP Header “"Authorization” to “Bearer {JWT TOKEN}" (where you replace “{JWT TOKEN}“ with the token acquired from step 1.)
   2. NOTE: The first attempt will fail with error code (403) since the user has not been assigned access to the API.
3. Grant the client permission to access the API (One time setup)
   1. Login to Treasury Systems as a user with “user manager” permission and open Roles and Permissions.
   2. Find the Treasury Systems user corresponding to the application/credentials used to call the API and grant it access (when using Microsoft Entra Id the login and name will be equal to the application’s “Object Id”).
       Once granted go back to step 2 and call the API again, this time it should succeed.

Examples

PowerShell code to download file using Microsoft Entra Id authentication

This sample requires that you have first registered a new “Application” in the Entra Id  See  API authentication: Register Application in Microsoft Entra Id. You will need your tenant Id, client Id, and secret from the registration.

# Define the OAuth2 endpoint and the form data

# TODO: replace your_client_id with current tenant id (or replace with your own token endpoint if using another IdentityProvider)

$tokenEndpoint = "https://login.microsoftonline.com/your_client_id/oauth2/v2.0/token" 

$body = @{

    # TODO: Enter client id from app registration

    client_id     = "your_client_id"

    # TODO: Enter client secret from app registration

    client_secret = "your_client_secret" 

    grant_type    = "client_credentials"

    # Use below scope for when using Microsoft Entra Id for login, if you use another IdentityProvider you might need to change it

    scope         = "https://app.treasurysystems.com/.default" 

}

# Authenticate using to the OAuth2 endpoint using client_credentials

$response = Invoke-RestMethod -Method Post -Uri $tokenEndpoint -ContentType "application/x-www-form-urlencoded" -Body $body

# Set headers to use when calling the API

$Aheaders = @{ Authorization = "Bearer $($response.access_token)"}

# Download the file

# TODO: Change TENANT the API call AND destination file name

$loginUri = "TENANT.treasurysystems.com" 

$apiCall ="api/marketdata/ir/v1?dateCode=20240312"

$destinationFile = "%TEMP%\ir.json"

Invoke-RestMethod -Method GET -Uri "https://$($loginUri)/$($apiCall)" -Headers $headers -OutFile $destinationFile

Logic Apps – using Microsoft Entra Id authentication

This sample requires that you have first registered a new “Application” in the Entra Id, see API authentication: Register Application in Microsoft Entra Id.

  You will need your tenant Id, client Id, and secret from the registration. 

1. Create a new logic app in Microsoft Azure
2. Add a new “HTTP” step
   1. Enter the Uri for the API call
   2. Click “Show all" at advanced parameters at the bottom and 
   3. Enter the following settings under Authentication
      1. Authentication Type: “Active Directory OAuth”
      2. Tenant: your tenant id
      3. Audience: https://app.treasurysystems.com 
      4. Client ID: your client id
      5. Credential Type: Secret
      6. Secret: your client secret
         
          

For more details you can look at How to use Oauth 2.0 Authorization in Logic App's HTTP connector? - Microsoft Q&A or he Logic apps documentation

Use CURL

The following example show how CURL can be used to get an access token from Microsoft Entra Id and call the API.

 This assumes you have followed the steps to setup an application.

Get the access token 

curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -d 'client_id={UseYourClientId}&scope=https://app.treasurysystems.com/.default&client_secret={UseYourSecret}&grant_type=client_credentials' 'https://login.microsoftonline.com/{UseYourTenantId}/oauth2/v2.0/token'

Replace {UseYourClientId},{UseYourSecret} and {UseYourTenantId} with your own values.

Get data using the accesstoken

curl -X GET -H "Authorization: Bearer {UseYourToken}" 'https://{CustumerName}.treasurysystems.com/api/marketdata/ir/v1?dateCode=20240312 '

Replace {UseYourToken} & {CustumerName} with your own values.

This will fail the first time.

If you get this message then somebody has to login to the TS application and add the permission ”Public API Access” to the newly created user. The name consists of numbers (matching the Object Id  from the application registration), please see step 4 under General steps to access the API for instructions on how to grant access.

Troubleshooting

When acquiring the token you might get an error “AADSTS501051 _invalid_client: AADSTS501051: Application \<application name\> isn't assigned to a role for the \<web API\>”. This happens in case you have chosen to limit access to Treasury Systems SaaS under “Enterprise Applications” in Entra.
If this happens you need to either remove assignment required or explicitly grant the registered application access to Treasury Systems SaaS.
The later cannot requires scripting since it is not, at the time of writing, available in the UI. For instructions see https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/assign-user-or-group-access-portal?pivots=aad-powershell