How do I authenticate with Jira REST API

[kardon]

I'm doing some pretty basic authentication stuff in PHP. The problem is, that I get a 403, saying that my authentication is denied, even tho I'm using my admin credentials. I'm using roughly the same code as in this question: https://community.atlassian.com/t5/Answers-Developer-Questions/JIRA-REST-api-in-PHP/qaq-p/530858

[Jakub Sławiński]

Are you using token to authenticate?

https://confluence.atlassian.com/cloud/api-tokens-938839638.html

[Jakub Sławiński]

In case you use Jira server:

https://developer.atlassian.com/server/jira/platform/security-overview/