Access Token

Learn how to get and use an access token

Each call to the REST API requires a valid access token.

Obtaining an Access Token

Use the following steps to obtain an access token.

NOTE: One access token can be used numerous times within its lifetime. Refer to Using an Access Token for more details.

Submit a request to the URL in the token endpoint
using an HTTP POST. Provide the following parameters in the request body:

Parameter Name Definition Type
client_id The client ID provided by Vertex for the custom integration String, required
client_secret The client secret provided by Vertex for the custom integration String, required
username The API key from Vertex Cloud for the client on whose behalf the calls will be made String, required
password The API password from Vertex Cloud for the client on whose behalf the calls will be made String, required
scope (Address Cleansing and Tax Calculation APIs) The string calc-rest-api String, required
scope (Adjustment File API) The string vtms-public-api openid profile String, required
grant_type The string password String, required

The client_id and client_secret parameters are issued for each integration against the REST API. They are confidential values and should not be exposed to any users of the integration.

The username and password parameters identify the Vertex Cloud account. These values must be provided to the integration and can vary if there are multiple installations of the integration or if the integration is used for multiple Vertex Cloud accounts.

The response from the call to the token endpoint is a JSON object.

Success Response

If the call is successful (HTTP status code = 200), the JSON object has multiple properties. For example:

"access_token": "valid_token_ID",
"token_type": "Bearer",
"expires_in": 1200

The access_token and token_type parameters are needed to make calls against the Vertex REST API. The expires_in parameter defines the number of seconds until the access token expires. After this time, a new token must be requested.

Error Response

If an error occurs (HTTP status code != 200), the JSON object has one “error” property with a message that describes the reason for failure. For example:

"error" : "invalid_client"

Using an Access Token

When an access token is successfully retrieved, the returned JSON object has multiple properties. The expires_in property defines how many seconds after the token is issued that the access token is valid. This token is added to the HTTP header to validate/authorize subsequent REST calls.

NOTE: Best practices dictate that an access token be used for most of its lifetime.

Use the expires_in property and the response time of the authorization request to determine if a new token is needed. Requesting a new access token for each REST request is not an acceptable practice because it reduces processing rates and increases processing times. Failure to reuse access tokens properly can cause rate limits on authorization requests to be exceeded.

Authorizing a Request

All API requests  against the REST API endpoints must be made over HTTPS. When making a request, set the access token in the ‘Authorization’ header of the request with the token type and access token. For example:

Authorization: Bearer {ACCESS_TOKEN}

Or, using the above response as an example:

Authorization: Bearer "valid_token_ID"

This example is for illustration purposes only. It will not work in the API.