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Changelog

The method allows you to add a cost invoice PDF file to a purchase order. It enables attaching an invoice issued by the supplier to the corresponding purchase order in Base.

purchase_order_id	int	Purchase order identifier from BaseLinker
file	text	Invoice PDF file in binary format encoded in base64. Provide a prefix "data:" at the beginning e.g. "data:4AAQSkSzkJRgABA[...]"
cost_invoice_no	varchar(100)	(optional) Cost invoice number

The method returns the data in JSON format.

status

varchar(30)

SUCCESS - request executed correctly ERROR - an error occurred during an API request. Error details will be described in 2 additional returned fields: error_message and error_code

Input data:
{ "purchase_order_id": 4521, "file": "data:4AAQSkZJRgABA[...]", "cost_invoice_no": "FV/2026/03/001" } Output data:
{ "status": "SUCCESS" } A sample request in PHP:
<?php $methodParams = '{ "purchase_order_id": 4521, "file": "data:4AAQSkZJRgABA[...]", "cost_invoice_no": "FV\/2026\/03\/001" }'; $apiParams = [ "method" => "addInventoryPurchaseOrderFile", "parameters" => $methodParams ]; $curl = curl_init("https://api.baselinker.com/connector.php"); curl_setopt($curl, CURLOPT_POST, 1); curl_setopt($curl, CURLOPT_HTTPHEADER, ["X-BLToken: xxx"]); curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($apiParams)); $response = curl_exec($curl);