DELETE /api/v1/addon-subscriptions/{addonSubscription_uuid}/unsubscribe
curl \
 --request DELETE https://api.plannrcrm.com/api/v1/addon-subscriptions/addonSubscription_uuid/unsubscribe \
 --header "Authorization: Bearer {OAUTH_ACCESS_TOKEN or PERSONAL_ACCESS_TOKEN}" \
 --header "Content-Type: application/json" \
 --header "Accept: application/json"