curl --location 'https://stg-gateway.invora.app/api/billing/v2/coupons/applied-coupons' \
--header 'Content-Type: application/json' \
--data '{
"amountCents": "string",
"amountCurrency": "CURRENCY_ENUM_UNSPECIFIED",
"couponId": "string",
"customerId": "string",
"frequency": "COUPON_FREQUENCY_UNSPECIFIED",
"frequencyDuration": 0,
"percentageRate": {
"units": "string",
"nanos": 0
}
}'