Your First API Call

The first step in making an API call to the EPC platform is getting authorized for access by obtaining a Partner OAuth Token.

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OAuth 2.0

The Encompass Partner Connect Platform (EPC) uses OAuth 2.0 for authentication and authorization. OAuth enables a client application to gain delegated access to information on behalf of the user without disclosing their credentials. If you are new to OAuth, you can learn more from the OAuth 2.0 specification guide, or one of the many beginner’s guides available online.


Creating a New Authentication Token


To obtain an OAuth token, use the Postman collection you downloaded and configured in your Postman client to make a POST operation to the https://api.elliemae.com/oauth2/v1/token endpoint. This request can be found in the sample EPC Postman collection. Find the Create Partner Authentication Token request in the Authentication and Authorization folder, as shown below.

POST /oauth2/v1/token HTTP/1.1
Host: api.elliemae.com
Content-Type: application/x-www-form-urlencoded

grant_type=client_credentials&client_id=<=CLIENT_ID>&client_secret=<CLIENT_SECRET>&scope=pc+pcapi

If your environment variables are configured correctly, you will not need to manually input parameters. Just click the Send button. A successful response will look like this:

{
    "access_token": "PDVF2zWjJcR1s0WwHabYxDod3BB4",
    "token_type": "Bearer",
    "expires_in": 7200
}

The attribute access_token holds the value of the OAuth token. The request in the EPC Postman collection is set up to copy the value of access_token to the partner_token environment variable. After you get a valid token, you can immediately make other EPC calls. You do not have to manually supply the value of access_token to other requests in the Postman collection.

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oAuth Access Token Life-time

This token will expire in two hours. The value of expires_in, 7200, is in seconds. Making calls using this token will not extend its life.

The following Python code snippet illustrates how to receive the same response in your EPC application:

import requests

url = "https://int.api.ellielabs.com/oauth2/v1/token"

payload = f"grant_type=client_credentials&client_id={CLIENT_ID}&client_secret={CLIENT_SECRET}&scope=pc%20pcapi"

headers = {
    'Content-Type': "application/x-www-form-urlencoded"
    }

response = requests.request("POST", url, data=payload, headers=headers)

print(response.text)

Introspecting an Existing Authentication Token


You can introspect the authentication token you created by making a POST request to the https://api.elliema.com/oauth2/v1/token/introspection endpoint. This request is under the Authentication and Authorization folder in the sample EPC Postman collection, as shown below:

Content-Type: application/x-www-form-urlencoded
Authorization: Basic YTVkcXJoYzprRnluSSFoQERhMTNLdF5VSDNtS2dEZ0M5MHloYWZnaSFkaXk1TGs5emJyejhWTmskRGNmM1RLTXN1YzVxTVcj


token=g3BZnPN7ONIC6YXP3NnW0zUHGY5d

You will see the following response body to your request:

{
    "active": true,
    "scope": "pc pcapi",
    "client_id": "{{API_CLIENT_ID}}",
    "token_type": "Bearer",
    "exp": 1577155896,
    "environment": "Test",
    "encompass_instance_id": "Test",
    "identity_type": "Partner",
    "encompass_client_id": "{{PARTNER_ID}}"
}

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Partner ID

Keep a copy of the returned encompass_client_id attribute on hand. This is your unique Partner ID with Ellie Mae. You will need it in subsequent API calls made in this exercise.



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