Download all invoices in JSON and PDF from web app SOLO.com.hr https://solo.com.hr/api-dokumentacija

Get-InvoicesFromSolo.ps1

<#
.SYNOPSIS
Download all invoices from SOLO.COM.HR API
#>

[CmdletBinding()]
param (
    [Parameter(Mandatory=$True)]
    [string]$Token,
    [switch]$RefreshInvoicesList,
    [switch]$RedownloadInvoices
)

$Url = "https://api.solo.com.hr/racun?token=$Token"
$InvoicesFile = Join-Path $PSScriptRoot ".\invoices.json"
$InvoicesRoot = Join-Path $PSScriptRoot ".\invoices"

# get all invoices
if (!(Test-Path $InvoicesFile) -or ($RefreshInvoicesList.IsPresent)) {
    $invoices = Invoke-WebRequest -UseBasicParsing $url
    $invoices.Content | Out-File $InvoicesFile
}


# create folder
If (!(Test-Path $InvoicesRoot)) {
    New-Item -Path $InvoicesRoot -ItemType Directory | Out-Null
}

# get individual invoices
$invoices = Get-Content $InvoicesFile | ConvertFrom-Json
$invoices.racuni | foreach {
    
    # https://docs.microsoft.com/en-us/dotnet/api/system.datetime.parseexact?redirectedfrom=MSDN&view=netcore-3.1#System_DateTime_ParseExact_System_String_System_String___System_IFormatProvider_System_Globalization_DateTimeStyles_
    # https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings?view=netcore-3.1
    $InvDate = [datetime]::ParseExact($_.datum_racuna,"d.M.yyyy. H:m:s",[Globalization.CultureInfo]::CreateSpecificCulture('hr-HR'))
    
    # create year folder
    $Year = $(Join-Path $InvoicesRoot $InvDate.Year)
    if (!(Test-Path $year)) {
        New-Item -Path $year -ItemType Directory
    }

    # create month folder
    $Month = Join-Path $Year $InvDate.Month
    if (!(Test-Path $Month)) {
        New-Item -Path $Month -ItemType Directory
    }

    # get single invoice by id
    $File = Join-Path $Month "$($_.id).json"
    if (!(Test-Path $File) -or ($RedownloadInvoices.IsPresent)) {
        $invoice = Invoke-WebRequest -UseBasicParsing $("$url&id="+$_.id)
        # write to disk only if status = 0 (https://solo.com.hr/api-dokumentacija/prikaz-racuna)
        if (($invoice.Content | ConvertFrom-Json).status -eq "0") {
            $invoice.Content | Out-File $File
            $invoice.Content
            # sleep because of API rate limit
            Start-Sleep -Seconds 11
        }
    }

    # get pdf file for invoice
    if (Test-Path $File) {
        # read json invoice from disk
        $InvoiceJson = Get-Content $File | ConvertFrom-Json

        # download PDF if does not exist yet
        $FilePdf = Join-Path $Month "$($InvoiceJson.racun.id)_$($InvoiceJson.racun.broj_racuna).pdf"
        if (!(Test-Path $FilePdf)) {
            Write-Host "Downloading $($InvoiceJson.racun.pdf) to $FilePdf"
            Invoke-WebRequest -UseBasicParsing -OutFile $FilePdf -Uri $($InvoiceJson.racun.pdf)
        }
    }

}