curl --request GET \
  --url https://api.sprucecollective.co.uk/rewards/referrals \
  --header 'Authorization: <api-key>'

[
  {
    "created_at": "<string>",
    "id": "<string>",
    "is_cancelled": true,
    "is_completed": true,
    "referee_user_id": "<string>",
    "referral_code": "<string>",
    "referrer_user_id": "<string>",
    "site_id": "<string>",
    "status": "<string>",
    "updated_at": "<string>"
  }
]