(Perl) Xero Download Attachment for an Item (such as an Invoice)

Demonstrates how to download a particular attachment for a particular Xero item.

For more information, see https://developer.xero.com/documentation/api/attachments#GET

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$http = chilkat::CkHttp->new();

$jsonToken = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/xero-access-token.json");
if ($success == 0) {
    print $jsonToken->lastErrorText() . "\r\n";
    exit;
}

$http->put_AuthToken($jsonToken->stringOf("access_token"));

# Replace the value here with an actual tenant ID obtained from this example:
# Get Xero Tenant IDs
$http->SetRequestHeader("Xero-tenant-id","83299b9e-5747-4a14-a18a-a6c94f824eb7");

$http->put_Accept("application/json");

# The example to list Xero attachments shows how to get attachment information.
# Here's a sample JSON response obtained form listing attachments:
# Your application can get the AttachmentID's and filenames from it.

# {
#   "Id": "24bfbcb9-dec9-4d33-835c-8f165d776766",
#   "Status": "OK",
#   "ProviderName": "Chilkat2222",
#   "DateTimeUTC": "\/Date(1587213296972)\/",
#   "Attachments": [
#     {
#       "AttachmentID": "daf106e2-8634-4349-bfcc-86c1df0793b2",
#       "FileName": "penguins.jpg",
#       "Url": "https://api.xero.com/api.xro/2.0/Invoices/0032f627-3156-4d30-9b1c-4d3b994dc921/Attachments/penguins.jpg",
#       "MimeType": "image/jpg",
#       "ContentLength": 777835
#     }
#   ]
# }

$url = "https://api.xero.com/api.xro/2.0/{$Endpoint}/{$Guid}/Attachments/{$AttachmentId}";

# Endpoint can be Invoices, Receipts, CreditNotes, PurchaseOrders, etc.
$http->SetUrlVar("Endpoint","Invoices");

# Guid is the ID of the item, such as the InvoiceID.
$http->SetUrlVar("Guid","0032f627-3156-4d30-9b1c-4d3b994dc921");

# AttachmentId is the ID of the particular attachment to be downloaded
$http->SetUrlVar("AttachmentId","daf106e2-8634-4349-bfcc-86c1df0793b2");

# Download the attachment data into bd.
$bd = chilkat::CkBinData->new();
$success = $http->QuickGetBd($url,$bd);
if ($success == 0) {
    print $http->lastErrorText() . "\r\n";
    exit;
}

print "Response Status Code: " . $http->get_LastStatus() . "\r\n";

if ($http->get_LastStatus() == 200) {
    # Success
    # Save to a file..
    $success = $bd->WriteFile("qa_output/penguines.jpg");
}
else {
    # Failed.  bd contains error information..
    print $bd->getString("utf-8") . "\r\n";
}