name is immutable - only default_value can be changed.null (or an empty string) as default_value to clear the default.curl --location --request PUT 'https://api.plusvibe.ai/api/v1/workspaces/additional-fields' \
--header 'x-api-key: <api-key>' \
--header 'Content-Type: application/json' \
--data '{
"workspace_id": "65099a0dd96fae8ab61130c0",
"name": "coupon_code",
"default_value": "WELCOME20"
}'{
"status": "success"
}