Return items of a sale receipt

This tutorial demonstrates how to handle item returns.
You''ll learn how to

Issue a return receipt for specific items of a sale receipt issued by the same Point of Sale or a different one
Issue a return receipt associated to a sale receipt that hasn't been issued by a Point of Sale.

Case 1: Sale receipt issued by a Point of Sale

Prerequisites

Receipts can be issued only by a merchant or a cashier with a valid certificate (PEM file).
Since our goal is to return items of a sale receipt, we will issue one from a cash register associated to the Point of Sale E001-000001:

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import requests

CERT_PATH = '/var/certs/pos/E001-000001/cashregister.pem'
KEY_PATH = '/var/certs/pos/E001-000001/cashregister.pem'
response = requests.post(
    'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt',
    cert=(CERT_PATH, KEY_PATH),
    json={
    "electronic_payment_amount": "244",
		"items": [
      {
        "good_or_service": "B",
        "quantity": "1",
        "description": "Product A",
        "unit_price": "100",
        "vat_rate_code": "22"
      },
      {
        "good_or_service": "B",
        "quantity": "1",
        "description": "Product B",
        "unit_price": "100",
        "vat_rate_code": "22"
      }
    ]
  }
)

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const fs = require('fs');
const https = require('https');

const CERT = fs.readFileSync('/var/certs/pos/E001-000001/cashregister.pem')
const KEY = fs.readFileSync('/var/certs/pos/E001-000001/cashregister.pem')
const req = https.request(
  {
    hostname: 'ereceipts-it-sandbox.acubeapi.com',
    headers: {
      "Content-Type": "application/json"
    },
    port: 444,
    path: '/mf1/receipt',
    method: 'POST',
    cert: CERT,
    key: KEY
  },
  res => {
    let body = '';
    res.on('data', function(data) {
      body += data;
    });
    res.on('end', function() {
      console.log(body);
    })
  }
);
req.write(JSON.stringify({
  "items": [
    {
      "good_or_service": "B",
      "quantity": "1",
      "description": "Product A",
      "unit_price": "100",
      "vat_rate_code": "22"
    },
    {
      "good_or_service": "B",
      "quantity": "1",
      "description": "Product B",
      "unit_price": "100",
      "vat_rate_code": "22"
    }
  ]
}));
req.end();

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curl -X POST https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt  \
-H 'Content-Type: application/json' \
-d '{"electronic_payment_amount":"244","items":[{"good_or_service":"B","quantity":"1","description":"Product A","unit_price":"100","vat_rate_code":"22"},{"good_or_service":"S","quantity":"1","description":"Product B","unit_price":"100","vat_rate_code":"22"}]}' \
--cert /var/certs/pos/E001-000001/cashregister.pem \
--key /var/certs/pos/E001-000001/cashregister.pem

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$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt');
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode('{
    "electronic_payment_amount": "244",
    "items": [
      {
        "good_or_service": "B",
        "quantity": "1",
        "description": "Product A",
        "unit_price": "100",
        "vat_rate_code": "22"
      },
      {
        "good_or_service": "B",
        "quantity": "1",
        "description": "Product B",
        "unit_price": "100",
        "vat_rate_code": "22"
      }
    ]
}'));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type:application/json']);
curl_setopt($ch, CURLOPT_SSLCERT, '/var/certs/pos/E001-000001/cashregister.pem');
curl_setopt($ch, CURLOPT_SSLKEY, '/var/certs/pos/E001-000001/cashregister.pem');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);

You will receive the following response:

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Response 201

{
  "uuid": "18a681da-a868-47ba-a931-2f702474c3d1",
  "type": "sale",
  "total_amount": "244",
  "document_number": "0001-0001",
  "document_datetime": "2025-09-01T10:00:00",
  "parent_receipt_uuid": null
}

Issue the return receipt

Supposing you are working from a cash register associated to the Point of Sale E001-000002 and you need to return the item Product B of the sale receipt above, you'd need to make the following HTTP request:

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import requests

CERT_PATH = '/var/certs/pos/E001-000002/cashregister.pem'
KEY_PATH = '/var/certs/pos/E001-000002/cashregister.pem'
response = requests.post(
    'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return',
    cert=(CERT_PATH, KEY_PATH),
    json={
      "pem_id": "E001-0001",
      "document_number": "0001-0001",
      "items": [
          {
              "good_or_service": "B",
              "quantity": "1",
              "description": "Product B",
              "unit_price": "100",
              "vat_rate_code": "22"
          }
      ]
    }
)

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const fs = require('fs');
const https = require('https');

const CERT = fs.readFileSync('/var/certs/pos/E001-000002/cashregister.pem')
const KEY = fs.readFileSync('/var/certs/pos/E001-000002/cashregister.pem')
const req = https.request(
  {
    hostname: 'ereceipts-it-sandbox.acubeapi.com',
    headers: {
      "Content-Type": "application/json"
    },
    port: 444,
    path: '/mf1/receipt/return',
    method: 'POST',
    cert: CERT,
    key: KEY
  },
  res => {
    let body = '';
    res.on('data', function(data) {
      body += data;
    });
    res.on('end', function() {
      console.log(body);
    })
  }
);
req.write(JSON.stringify( {
            "document_number": "0001-0001",
            "items": [
                {
                    "good_or_service": "B",
                    "quantity": "1",
                    "description": "Product B",
                    "unit_price": "100",
                    "vat_rate_code": "22"
                }
            ]
        }));
req.end();

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curl -X POST https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return  \
-H 'Content-Type: application/json' \
-d '{"document_number":"0001-0001","items":[{"good_or_service":"B","quantity":"1","description":"Product B","unit_price":"100","vat_rate_code":"22"}]}' \
--cert /var/certs/pos/E001-000002/cashregister.pem \
--key /var/certs/pos/E001-000002/cashregister.pem

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$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return');
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode('{
            "document_number": "0001-0001",
            "items": [
                {
                    "good_or_service": "B",
                    "quantity": "1",
                    "description": "Product B",
                    "unit_price": "100",
                    "vat_rate_code": "22"
                }
            ]
        }'));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type:application/json']);
curl_setopt($ch, CURLOPT_SSLCERT, '/var/certs/pos/E001-000002/cashregister.pem');
curl_setopt($ch, CURLOPT_SSLKEY, '/var/certs/pos/E001-000002/cashregister.pem');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);

The response will be:

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Response 201
{
  "uuid": "25a34bea-3418-17ba-ac31-2f704474abb3",
  "type": "return",
  "total_amount": "122",
  "document_number": "0001-0002",
  "document_datetime": "2025-09-01T11:00:00",
  "parent_receipt_uuid": "18a681da-a868-47ba-a931-2f702474c3d1"
}

info

If the return receipt is issued by the same Point of Sale that issued the sale receipt, you can avoid to specify the pem_id in the request. If you specify it, the request will still be processed correctly as long as the cash register from which you are working is associated to the specified Point of Sale.

Case 2: Sale receipt not issued by a Point of Sale

It might be that the sale receipt has not been issued by a Point of Sale, so it is not possible to specify a document_number. In this case you should make a POST request to /mf1/receipts/return-with-proof:

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import requests

CERT_PATH = '/var/certs/pos/E001-000001/cashregister.pem'
KEY_PATH = '/var/certs/pos/E001-000001/cashregister.pem'
response = requests.post(
    'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return-with-proof',
    cert=(CERT_PATH, KEY_PATH),
    json= {
    "proof": "POS",
    "document_datetime": "2025-09-01T10:00:00",
    "items":
    [
        {
            "good_or_service": "B",
            "quantity": "1",
            "description": "Product B",
            "unit_price": "100",
            "vat_rate_code": "22"
        }
    ]
}
)

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const fs = require('fs');
const https = require('https');

const CERT = fs.readFileSync('/var/certs/pos/E001-000001/cashregister.pem')
const KEY = fs.readFileSync('/var/certs/pos/E001-000001/cashregister.pem')
const req = https.request(
  {
    hostname: 'ereceipts-it-sandbox.acubeapi.com',
    headers: {
      "Content-Type": "application/json"
    },
    port: 444,
    path: '/mf1/receipt/return-with-proof',
    method: 'POST',
    cert: CERT,
    key: KEY
  },
  res => {
    let body = '';
    res.on('data', function(data) {
      body += data;
    });
    res.on('end', function() {
      console.log(body);
    })
  }
);
req.write(JSON.stringify( {
    "proof": "POS",
    "document_datetime": "2025-09-01T10:00:00",
    "items":
    [
        {
            "good_or_service": "B",
            "quantity": "1",
            "description": "Product B",
            "unit_price": "100",
            "vat_rate_code": "22"
        }
    ]
}));
req.end();

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curl -X POST https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return-with-proof  \
-H 'Content-Type: application/json' \
-d '{"proof":"POS","document_datetime":"2025-09-01T10:00:00","items":[{"good_or_service":"B","quantity":"1","description":"Product B","unit_price":"100","vat_rate_code":"22"}]}' \
--cert /var/certs/pos/E001-000001/cashregister.pem \
--key /var/certs/pos/E001-000001/cashregister.pem

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$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://ereceipts-it-sandbox.acubeapi.com:444/mf1/receipt/return-with-proof');
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode('{
    "proof": "POS",
    "document_datetime": "2025-09-01T10:00:00",
    "items":
    [
        {
            "good_or_service": "B",
            "quantity": "1",
            "description": "Product B",
            "unit_price": "100",
            "vat_rate_code": "22"
        }
    ]
}'));
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type:application/json']);
curl_setopt($ch, CURLOPT_SSLCERT, '/var/certs/pos/E001-000001/cashregister.pem');
curl_setopt($ch, CURLOPT_SSLKEY, '/var/certs/pos/E001-000001/cashregister.pem');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);

info

This endpoint requires you to specify time and date of the sale receipt for which you are returning items.

info

the field proof can be set to one of "POS", "VR" (vuoti a rendere), or "ND" (non definito). "POS" in this case refers to a payment processing device, not the Point of Sale entity referred to in this documentation.