API tokens are available in Atlassian Cloud only. If you're using for example Jira Server, you should use credentials instead.
When using REST API to integrate Jira Cloud, API token needs to be used for authentication. Earlier username & password was allowed, but this has been changed lately. In ONEiO, api token is inserted as the password. No other changes are needed.
How to create an API token:
Create an API token from the integration user's Atlassian account:
- Login with your integration user your Jira
- Navigate to https://id.atlassian.com/manage/api-tokens.
- Click Create API token.
- From the dialog that appears, enter a memorable and concise Label for your token and click Create. The label works as the name of your API token.
- Click Copy to clipboard, then paste the token to outbound user's password field in ONEiO Endpoint configuration.
Store your token securely, like any password!
More details from Atlassian Cloud Support.