curl --location '/rates/payment_method_rate?merchantId=undefined&paymentMethod=undefined¤cyFrom=undefined¤cyTo=undefined' \
--header 'X-MerchantId;' \
--header 'X-Secret;'{
"paymentMethod": 2,
"currencyFrom": "USDT",
"currencyTo": "RUB",
"rate": 0.0105,
"updatedAt": "2025-08-11T10:15:00Z"
}