curl --request POST \
  --url https://eu.sequencehq.com/api/customers/{customer}/contacts \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: application/json' \
  --data '{
  "name": "John Smith",
  "email": "john.smith@example.com",
  "billingPreference": "NONE"
}'

{
  "id": "9a1e38a9-4dc9-776f-f974-4e7ee9f4d6cc",
  "name": "John Smith",
  "email": "john.smith@example.com",
  "billingPreference": "NONE",
  "createdAt": "2022-06-28T16:47:00Z",
  "updatedAt": "2022-06-28T16:47:00Z",
  "archivedAt": "2023-06-28T16:47:00Z"
}