Test a subscription function

curl --request POST \
  --url https://dashboard.getconvoy.io/api/v1/projects/{projectID}/subscriptions/test_function \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "function": "<string>",
  "payload": {}
}'

{
  "message": "<string>",
  "status": true,
  "data": {
    "log": [
      "<string>"
    ],
    "payload": "<any>"
  }
}