API documentation - baselinker.com

The method allows to issue an order invoice correction.
Either original_invoice_id or return_order_id must be provided.
If return_order_id is provided, all other fields will be ignored (except series_id) and invoice will be created with data from the return order.
If field is optional and not provided, it will be set according to the series settings or default values.

Input parameters

original_invoice_id	int	Original invoice identifier
return_order_id	int	Return order identifier
series_id	int	(optional) Series numbering identifier
date_sell	int	(optional) Sell date in unix timestamp
correcting_reason	int	(optional) Reason for correction - 1: prepayments return - 2: compulsory discounts - 3: price increase after invoicing - 4: refund the buyer the amount of undue - 5: return the goods - 6: mistakes as to price, rate, amount of tax on invoices or position - 7: correcting buyer's address - 8: withdrawal from the contract - 9: other reason - fill in in the comments
correcting_items	bool	(optional) Whether to correct invoice items (0 - no, 1 - yes)
correcting_data	bool	(optional) Whether to correct invoice data (0 - no, 1 - yes)
invoice_fullname	string	(optional) Full name for the invoice
invoice_company	string	(optional) Company name
invoice_address	string	(optional) Address
invoice_postcode	string	(optional) Postal code
invoice_city	string	(optional) City
invoice_state	string	(optional) State/Province
invoice_country_code	string	(optional) Country code (e.g. PL)
invoice_nip	string	(optional) Tax ID number
items	array	(optional) Array of items to correct. If order_product_id is not provided, item will be added as new position at the end
fv_payment	string	(optional) Payment method
fv_person	string	(optional) Issuer name

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
invoice_id	int	ID of the added invoice.

Input data:
Output data:
A sample request in PHP:

<?php
$methodParams = '{
    "original_invoice_id": 1,
    "series_id": 2,
    "date_sell": 1407341754,
    "correcting_reason": 1,
    "correcting_items": 1,
    "correcting_data": 1,
    "invoice_fullname": "John Doe",
    "invoice_company": "Big Company",
    "invoice_address": "Street 10",
    "invoice_postcode": "01-234",
    "invoice_city": "Warsaw",
    "invoice_state": "Masovian",
    "invoice_country_code": "PL",
    "invoice_nip": "1234567890",
    "items": [
        {
            "item_name": "Test Product",
            "item_sku": "TestProductSku",
            "item_ean": "12345678",
            "item_quantity": 1,
            "item_price_brutto": 25,
            "item_tax_rate": 19
        }
    ],
    "fv_payment": "Transfer",
    "fv_person": "Kierownik"
}';
$apiParams = [
    "method" => "addInvoiceCorrection",
    "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);