Hello,
I'm trying to write a script that allow me to validate the jira user credentials
Could you please tell me What JIRA REST method could I call to make sure that the entered username and password are correct and belong to a valid Jira user?
Thanks in advance
Any of them - the REST interface needs the process to login (or provide credentials generated by a previous login). You could simply log in and try to read an issue. If your credentials are right, it'll give you an issue or a "not found" message. If they're wrong, it'll simply refuse access.
Have a look through the "authentication" section at https://developer.atlassian.com/jiradev/jira-apis/jira-rest-apis/jira-rest-api-tutorials/jira-rest-api-version-2-tutorial
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