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Password Grant¶

You can obtain an access token by providing the resource owner's username and password as an authorization grant. It requires the base64 encoded string of the consumer-key:consumer-secret combination. You need to meet the following prerequisites before using the Token API to generate a token.

Prerequisites¶

A valid user account in the API Store.
A valid consumer key and consumer secret pair. Initially, these keys must be generated through the API Store by clicking the Generate link on My Subscriptions page.

Invoke the Token API to generate tokens¶

Combine the consumer key and consumer secret keys in the following format and encode the combined string using base64:

consumer-key:consumer-secret

Here's an example of an encoded consumer key and secret combination:

wU62DjlyDBnq87GlBwplfqvmAbAa:ksdSdoefDDP7wpaElfqvmjDue
Access the Token API using a REST client such as cURL with the following parameters.
- Token API URL - https://gateway.api.cloud.wso2.com/token.
- payload - grant_type=password&username=<username>&password=<password>&scope=<scope>. Replace the username and password values as appropriate. If your email is [email protected] and the organization key is johnsorg, then the username is [email protected]@johnsorg You can find the organization key via https://cloudmgt.cloud.wso2.com/cloudmgt/site/pages/organization.jag
  
  Tip
  <scope> is optional.
  
  You define scopes for your API's resources so that the resource can only be accessed through a token that has been issued for at least the scope belonging to the resource. For example, if a resource has a scope named 'update' and if the token is issued for the scopes 'read' and 'update', then the token is allowed to access the resource. If the token is issued for 'read' only, the request bearing the particular token will be blocked.
- headers - Authorization: Basic <base64 encoded string>, Content-Type: application/x-www-form-urlencoded. Replace the <base64 encoded string> as appropriate.
For example, use the following cURL command to access the Token API. It generates two tokens as an access token and a refresh token. You can use the refresh token at the time a token is renewed.
```
curl -k -d "grant_type=password&username=<username>&password=<password>" -H "Authorization: Basic <base64 encoded (consumer key:consumer secret)>" -H "Content-Type: application/x-www-form-urlencoded" https://gateway.api.cloud.wso2.com/token
```
User access tokens have a fixed expiration time, which is set to 60 minutes by default. When a user access token expires, you need to regenerate the token.

Instead of using the Token API, you can also generate access tokens from the API Store UI.

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