curl --request POST \
  --url https://api.contiguity.com/send/whatsapp/reactions \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "to": "+1234567890",
  "action": "add"
}'

{
  "id": "req_xxxxxxxxxxxxxxxx",
  "timestamp": 1755815097884,
  "api_version": "v2025.8.21",
  "object": "response",
  "data": {
    "status": "added",
    "message": "Reaction added for +1 555 555 5555"
  }
}