Jira Cloud Project Properties REST API documentation
DEMO - ADD OR UPDATE
curl --request PUT \ --url 'https://x.atlassian.net/rest/api/3/project/PP/properties/epp-hello' \ --user 'email@example.com:<api_token>' \ --header 'Accept: application/json' \ --header 'Content-Type: application/json' \ --data '"<property value here>"'
Please note. Property name must starts with prefix epp- e.g. epp-customer.name
DEMO - DELETE
curl --request DELETE \ --url 'https://x.atlassian.net/rest/api/3/project/PP/properties/epp-hello' \ --user 'email@example.com:<api_token>'