curl --location --request POST 'https://gateway-staging.instacash.hu/bnpl/external/one-click/v2/complete-login' \
--header 'X-Api-Key: <api-key>' \
--header 'Content-Type: application/json' \
--data-raw '{
"secondFactorId": "string",
"nonce": "string",
"code": "string"
}'{
"apiKey": "string",
"expirationDate": "string"
}