curl --request POST \
  --url https://api.reftree.co/participants/{participantId}/conversions \
  --header 'Content-Type: application/json' \
  --data '{
  "amount": 123,
  "currencyCode": "<string>"
}'

{
  "id": "<string>",
  "amount": 123,
  "currencyCode": "<string>"
}