Currently, the REST API only allows me to create customer.
However, i would like to know if there's a way I can update an existing customer using this API ? => change the name, etc.
Furthermore, I also want to create a new customer key/value for this user ? i can do that using the UI, but i need the feature in REST API.
In your scenario, (please try in development first) You can try removing existing customer using Remove Customers and again add customer with new key/value. I do not see rest call for update/put already existed customer in the service-desk rest docs.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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