package main

import (
    "fmt"
    "time"
    appstore_sdk "github.com/kachit/appstore-sdk-go"
)

func yourFuncName(){ 
    cfg := appstore_sdk.NewConfig("foo", "bar", "baz", "path/to/your/private.key")
    client := appstore_sdk.NewClientFromConfig(cfg, nil)
    
    //Build auth token
    err := client.Init()
    fmt.Println(err)

    //Build filter
    date, _ := time.Parse("2006-01-02", "2020-05-05")
    filter := &appstore_sdk.SalesReportsFilter{}
    filter.Daily().TypeSales().SubTypeSummary().Version10().SetReportDate(date)

    //Get data
    resp, err := client.SalesReports().GetReport(filter)
    if resp.IsSuccess() {
        reports := []*appstore_sdk.SalesReportSale{}
        err = resp.UnmarshalCSV(&reports)
        fmt.Println(reports[0])
    } else {
        var errorResult *appstore_sdk.ErrorResult
        _ = resp.UnmarshalError(&errorResult)
        err := errorResult.GetError()
        fmt.Println(err)
    }
}