curl --request POST 'https://api.mayar.id/credit/v1/credit/customer/spend' \
--header 'Authorization: Bearer Paste-Your-API-Key-Here' \
--data '{
    "memberId" : "KKGOL1MV", // optionally mandatory
    "productId": "40f26fbe-f4d8-4693-975f-e6d105d291e6",
    "membershipTierId": "9bbbfa01-1bf8-4e4d-8470-cdf7066b6ea2",
    "amount": 10
}'

{
    "statusCode": 200,
    "message": "Successfully spent 10. MEMBERSHIP: 10, ADD_ON: 0"
}