Update a Custom Field Checkbox

Jira Development Jira Cloud
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1

Hello Support Team, i try to find a way to update following custom field to “null (not set)” or “yes” using REST-API.

This is a partly response from: /rest/api/2/issue//editmeta

"customfield_11548": {
			"required": false,
			"schema": {
				"type": "array",
				"items": "option",
				"custom": "com.atlassian.jira.plugin.system.customfieldtypes:multicheckboxes",
				"customId": 11548
			},
			"name": "CUSTOM NAME",
			"key": "customfield_11548",
			"operations": [
				"add",
				"set",
				"remove"
			],
			"allowedValues": [
				{
					"self": "<my-url>/rest/api/2/customFieldOption/12697",
					"value": "yes",
					"id": "12697"
				}
			]
		}
2

Welcome to the Atlassian developer community @RenKupperian,

Although you tagged Jira Cloud, this answer from Jira Server still applies:
https://confluence.atlassian.com/jirakb/update-select-list-value-to-none-in-jira-using-rest-api-834212926.html

Specifically, you can edit issue with PUT /rest/api/3/issue/{issueIdOrKey} (same goes for v2 API, if you need that instead), using this payload:

{
    "fields": {
        "customfield_11548": null
    }
}