You can get the Jira Server issue attribute names with the following endpoint:
https://[servidor].atlassian.net/rest/api/3/issue/createmeta?expand=projects.issuetypes.fields&projectKeys=[key del proyecto]
The property [Project key] You can consult it on the platform
projects > issuetypes > fields: In this location you will find the information of the fields
Projects > ID: Project ID
Projects > key: Project Key