PHP Wrapper for Quaderno API

This library is a PHP wrapper to connect and handle the Quaderno API in a nicer way.

A Quaderno account is needed for using it. You can sign up for a free trial or use our sandbox environment to test your integration before going live.

Requirements

• PHP 5 or higher
• cURL (included by default in recent PHP versions)

Installation

Install via Composer, or just copy all the files into a single folder in your project.

Usage

A rule of thumb to take into account when using the wrapper is that calls to the API are actually only made with the methods: 'find()', 'save()', 'delete()', 'deliver()' and 'ping()'.

To obtain correct tax calculations, it's key to set your account defaults correctly. Tax calculation API calls infer any parameter not explicitly set in the call from your account configuration. Check https://developers.quaderno.io/guides/tax-calculations to learn more.

Load

require_once 'quaderno_load.php';

Setup

QuadernoBase::init('YOUR_API_KEY', 'YOUR_API_URL', API_VERSION); // API_VERSION is optional as it defaults to the account API version

Testing connection

QuadernoBase::ping();   // returns true (success) or false (error)

Pagination

⚠️ There's a known limitation on the current version of the PHP wrapper which does not allow to easily inspect response headers, like the ones used to facilitate pagination from version 20210316 (X-Pages-NextPage and X-Pages-HasMore). For now, you can workaround that either by playing with more requests with smaller data ranges and higher limit to fetch more docs (max 100); or fetch your first find data with any query and then perform another paginated request with the created_before parameter and the ID of the last returned document, until the response is empty.

// Simple example to request all pages from the given dates until all invoices have been returned:
$invoices = [];
$filters['limit'] = '50'; // bunches of 50 invoices per request
$filters['date']= "$from,$to"; // please use dates to avoid always getting all invoices
do {
  $data = QuadernoInvoice::find($filters);
  if (is_array($data) && !empty($data)) {
    $invoices = array_merge($invoices, $data);
    $last_invoice = end($data); // advances array's internal pointer to the last element, and returns its value
    $filters['created_before'] = $last_invoice->id; // paginate from there
  }
} while (!empty($data));

Taxes

Quaderno allows you to calculate tax rates and validate tax IDs.

Calculating taxes

Check our API docs to know all valid parameters.

$params = array(
  'to_country' => 'ES',
  'to_postal_code' => '08080'
);

$tax = QuadernoTaxRate::calculate($params);   // returns a QuadernoTax
$tax->name;  // 'IVA'
$tax->rate;  // 21.0


// A non-processable request (due to invalid data, outages, etc.) returns false boolean
QuadernoBase::init('fakeApiKey', 'https://fake-subdomain.quadernoapp.com/api/');

$tax = QuadernoTaxRate::calculate($params);
$tax // false

// Example using a callback to get the specific error response
$tax = QuadernoTaxRate::calculate($params, function($apiErrorResponse) use (&$errorResponse) {
  $errorResponse = $apiErrorResponse;
});

$tax; // false
$errorResponse['http_code']; // 401
$errorResponse['data']['error']; // "Wrong API key or the user does not exist."

Validate tax ID

Check our API docs to know the supported tax jurisdictions.

$params = array(
  'country' => 'ES',
  'tax_id' => 'ESA58818501'
);

QuadernoTaxId::validate($params);   // returns boolean (true or false)

Contacts

A contact is any customer or vendor who appears on your invoices, credit notes, and expenses.

Find contacts

Returns false if request fails.

$contacts = QuadernoContact::find();                              // returns an array of QuadernoContact
$contacts = QuadernoContact::find(array('created_before' => 2));  // returns an array of QuadernoContact
$contact = QuadernoContact::find('ID_TO_FIND');                   // returns a QuadernoContact

Creating and updating a contact

$params = array('first_name' => 'Joseph',
                'last_name' => 'Tribbiani',
                'email' => 'joseph@friends.com',
                'contact_name' => 'Joey');
$contact = new QuadernoContact($params);
$contact->save(); // returns true (success) or false (error)

$contact->first_name = '';
$contact->save(); // returns false - first_name is a required field

// print errors
foreach($contact->errors as $field => $errors) {
  print "{$field}: ";
  foreach ($errors as $e) print $e;
}

$contact->first_name = 'Joey';
$contact->save();

Retrieve a contact by payment processor ID

$gateway = 'stripe';
$customer_id = 'cus_Av4LiDPayM3nt_ID';

$contact = QuadernoContact::retrieve($id, $gateway);  // returns a QuadernoContact (success) or false (error)

Products

Products are those goods or services that you sell to your customers.

Find products

Returns false if request fails.

$items = QuadernoProduct::find();              // returns an array of QuadernoProduct
$items = QuadernoProduct::find('ID_TO_FIND');  // returns a QuadernoProduct

Creating and updating a product

$params = array('name' => 'Jelly pizza',
                'code' => 'Yummy',
                'unit_cost' => '15.00');
$item = new QuadernoProduct($params);
$item->save();  // returns true (success) or false (error)

$item->name = '';
$item->save();  // returns false - name is a required field

foreach($item->errors as $field => $errors) {
  print "{$field}: ";
  foreach ($errors as $e) print $e;
}

$item->name = 'Jelly Pizza';
$item->save();

Transactions

Create a Transaction object to easily send sales & refunds from your app to Quaderno. We'll use them to issue invoices & credit notes, as well as update tax reports automatically.

Create a transaction

$params = array(
  'type' => 'sale',
  'customer' => array(
    'id' => $contact->id
  ),
  'date' => date('Y-m-d'),
  'currency' => 'EUR',
  'processor' => 'YOUR_APP_NAME',
  'processor_id' => 'TRANSACTION_ID_IN_YOUR_APP',
  'payment' => array(
    'method' => 'credit_card',
    'processor' => 'stripe',
    'processor_id' => 'ch_1IMFwhB2xq6voISLLk4I1KeE'
  ),
  'notes' => 'With mobile version'
);

$transaction = new QuadernoTransaction($params);

$items = array();
array_push( $items, array('description' => 'Pizza bagles', 'quantity' => 10, 'amount' => 99.90));
$transaction->items = $items;

$transaction->save(); // returns true (success) or false (error)

Billing documents

A billing document is either an invoice, an expense, a credit or an estimate.

Find documents

$invoices = QuadernoInvoice::find();                              // returns an array of QuadernoInvoice
$invoices = QuadernoInvoice::find(array('created_before' => 2));  // returns an array of QuadernoInvoice
$invoice = QuadernoInvoice::find('ID_TO_FIND');                   // returns a QuadernoInvoice

Note: In order to looking up for number, contact name or P.O. number fields, you must set the 'q' param in the params array.

$invoices = QuadernoInvoice::find(array('q' => '0001')); // search filtering

Retrieve a document by payment processor ID

$gateway = 'stripe';
$payment_id = 'ch_Av4LiDPayM3nt_ID';
$refund_id = 'ch_Av4LiDR3fuNd_ID';

$invoice = QuadernoInvoice::retrieve($payment_id, $gateway); // returns a QuadernoInvoice (success) or false (error)
$credit_note = QuadernoCredit::retrieve($refund_id, $gateway); // returns a QuadernoCredit (success) or false (error)

Create and update a document

$params = array('currency' => 'EUR',
                'notes' => 'With mobile version');

$estimate = new QuadernoEstimate($params);
$estimate->addContact($contact);

$item = new QuadernoDocumentItem(array('description' => 'Pizza bagles', 'unit_price' => 9.99, 'quantity' => 20));
$estimate->addItem($item);

$estimate->save();  // returns true (success) or false (error)

$estimate->notes = 'Finally, no mobile version will be necessary';
$estimate->save();

Deliver a document

Only possible in invoices, credit notes, and estimates. The contact must have an email address defined.

$invoice->deliver();  // returns true (success) or false (error)

Payments

Payments in Quaderno-lingo represent the recording of a successful payment.

Add a payment to a document

You can add a payment only to invoices and expenses. Input should be a QuadernoPayment object.

$payment = new QuadernoPayment(array('date' => date('Y-m-d'), 'payment_method' => 'credit_card'));
$invoice->addPayment($payment);   // returns true (success) or false (error)
$invoice->save();                 // returns true (success) or false (error)

Get payments

$payments = $invoice->getPayments();  // returns an array of QuadernoPayment

Remove a payment

$invoice->removePayment($payments[2]);  // returns true (success) or false (error)

Evidence

Location evidence are proofs of the customer's location that should be stored in order to be compliant with tax rules in some tax jurisdictions (e.g. EU VAT).

Creating a location evidence

$evidence = new QuadernoEvidence(array('document_id' => $invoice->id, 'billing_country' => $contact->country, 'ip_address' => '127.0.0.1', 'bank_country' => 'ES'));
$evidence->save();  // returns true (success) or false (error)

Webhooks

Webhooks refers to a combination of elements that collectively create a notification and reaction system within a larger integration.

Find webhooks

Returns false if request fails.

$sessions = QuadernoCheckoutSession::find();                    // returns an array of QuadernoCheckoutSession
$sessions = QuadernoCheckoutSession::find('ID_TO_FIND');          // returns a QuadernoCheckoutSession

Sessions

A Checkout Session represents your customer's session as they pay for one-time purchases or subscriptions through Quaderno Checkout.

Creating and updating a Checkout Session

$params = array('cancel_url' => 'http://myapp.com/back',
                'success_url' => 'http://myapp.com/thank-you',
                'items' => array(array('product' => 'prod_123456'));

$session = new QuadernoCheckoutSession($params);
$session->save();              // returns true (success) or false (error)

$session->success_url = '';
$session->save();              // returns false - url is a required field

foreach($session->errors as $field => $errors) {
  print "{$field}: ";
  foreach ($errors as $e) print $e;
}

$session->success_url = 'http://mapp.com/thank-you?product=xxxxx';
$session->save();

More information

Remember this is only a PHP wrapper for the original API. If you want more information about the API itself, head to the original API documentation.

License

(The MIT License)

Copyright © 2013-2023 Quaderno

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.