WalletsAPI.CustomersIdWalletsGet(context, id).Execute() function returning error

## Problem Summery
`WalletsAPI.CustomersIdWalletsGet(context, id).Execute()` function returning error:
```
json: cannot unmarshal string into Go struct field DtoWalletResponse.balance of type float32
```

## Root Cause
api json response returning string value, but struct data type in float32, conversion not applied properly

Start by locating WalletsAPI.CustomersIdWalletsGet(context, id).Execute() and the DtoWalletResponse.balance field. Trace how the API response is unmarshaled, then verify that a string balance no longer causes the reported error and that the wallet request completes successfully.

Written by the indexing model from the issue text.