Redeem Stamp Reward
This API marks a stamp as redeemed after the customer has collected all required stamps and used the provided reward (e.g., free drink, discount, etc.).
 Once redeemed, the stamp can no longer be used, and the customer must receive a new one.
 It is used in systems that manage stamp accumulation and reward redemption based on customer visits or purchases. 
This API is available for Personal plans and higher.
PUT
/api/stamp/v1/redeem
{
    "stampIdx": 394,
    "onsitePwd": "12345"
}Request Parameters
- stampIdxintegerrequired
- Stamp IDX.
- onsitePwdstring
-  Employee authentication password used for on-site stamps.
 Required only when the stamp hasonsiteYn = Y, and must be entered by staff when approving a customer’s reward redemption (e.g., free drink).
 Refer to theonsitePwdvalue returned by theValidate APIfor input.
{
    "code": 0,
    "message": "",
    "result": null
}Response Parameters
- codeinteger
- Response code: 0 = Success, other values = Error
- messagestring
- Response message. If the response code is not 0, an error message is returned.
- resultnull