Add Stamp
This API adds one stamp mark to an existing stamp.
 When a customer completes a purchase or a specific action, calling this API will add a stamp to their card.
 However, the number of stamps cannot exceed the maximum set for the stamp card.
This API is available for Personal plans and higher.
PUT
/api/stamp/v1/add
{
    "stampIdx": 394
}Request Parameters
- stampIdxintegerrequired
- Stamp IDX.
{
    "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