curl --request POST \
  --url https://api.clipping.cc/v1/collections/{collection_id}/subscribe \
  --header 'Authorization: Bearer <token>'

{
  "subscription": {
    "subscription_id": "<string>",
    "collection_id": "<string>",
    "user_id": "<string>",
    "price_microcoins": 123,
    "price_coins": 123,
    "started_at": 123,
    "expires_at": 123
  }
}