
Hi David,
1) Status variable doesn't impact on Rest execution. It allows saving rest execution response code.
2) Yes, you can use variables and also data templates inside rest connection URL. In your case, you can use the next URL: https://jira.client.gov/rest/zapi/latest/execution/@ID/execute
3) You need to use 'BODY_JSON' to read 'id' from the response because the presented response is in JSON format. For the response in plain text format, you have to use BODY_TEXT, for the response in XML format, you have to use BODY_XML.