In the Jira REST API documentation, there is a section explaining the Pagination:

• https://developer.atlassian.com/cloud/jira/platform/rest/#pagination

This section can be improved if there are some examples how to set a URL, appending a &startAt=0, similar to this page:

• https://developer.atlassian.com/server/confluence/pagination-in-the-rest-api/

Similar examples in the Jira REST API documentation will help users how to use pagination accordingly.