Create a new webhook endpoint

curl --request POST \
  --url https://channels-service-alpha.fourvenues.com/webhooks/endpoints \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '{
  "name": "<string>",
  "url": "<string>"
}'

{
  "_id": "<string>",
  "name": "<string>",
  "url": "<string>",
  "sign_secret": "<string>"
}