curl --request POST \
--url https://staging-api.getpartna.com/v4/convert/preorder \
--header 'Content-Type: application/json' \
--header 'x-api-key: <api-key>' \
--header 'x-api-user: <api-key>' \
--data '{
"accountName": "",
"fromAmount": 0,
"rateKey": "",
"transactionReference": ""
}'