Redeem a referral code

curl --request POST \
  --url https://api.useautumn.com/v1/referrals/redeem \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "code": "<string>",
  "customer_id": "<string>"
}'

{
  "id": "<string>",
  "customer_id": "<string>",
  "reward_id": "<string>"
}