@Pradeep BudharapuI'm afraid that there is not rest API to fetch Project Template Key.
But the set of available is limited and depend upon feature that you have installed/enabled on your cloud site.
Here is list of available templates, for each feature type.
Also please visit this page for more details - https://developer.atlassian.com/cloud/jira/platform/rest/v3/#api-rest-api-3-project-post
@Pradeep BudharapuProject templates are used to define structure on project, take it as a meta of meta for project. Once project meta is defined (project created) all information from project template is inside project meta, and there is no need for project template now.
Project type like, 'business, software, service-desk' are still stored in project.
Jira differentiates between projects on the project key.
Every project has has a set of configurations (meta data) which determines how it works. The template is used to create a set of configurations for the project upon creation, these are then used by the project and define how it works. You can change these configurations, and they can be shared between projects.
The template used to create a project is not recorded - it's useless after the project is created because an admin can (and often does) change the configuration.
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