x-api-key: ********************
curl --location --request POST '/api/v1/payment-fiat-rates/fiat-rates/update-ngn' \
--header 'x-api-key: <api-key>'
{
"success": true,
"data": {
"currency": "string",
"rate": 0,
"source": "string",
"timestamp": "string"
}
}