sample_snipcart.php

<?php

class Product
{
    public function __construct()
    {
        add_action( 'rest_api_init', [$this, 'register_api'] );
    }

    public function register_api()
    {
        /**
         * Webhook Shipping
         */
        register_rest_route( 'caron/'.$this->version, '/shipping', array(
            'methods' => 'POST',
            'callback' => [$this, 'shipping']
        ));

        /**
         * Webhook Order
         */
        register_rest_route( 'caron/'.$this->version, '/order', array(
            'methods' => 'POST',
            'callback' => [$this, 'order']
        ));

        /**
         * Webhook Custom payment gateway
         */
        register_rest_route( 'caron/'.$this->version, '/payment-methods', array(
            'methods' => 'POST',
            'callback' => [$this, 'payment_methods']
        ));
    }

    public function payment_methods()
    {
        $this->authenticateRequest();

        $json = file_get_contents('php://input');
        $body = json_decode($json, true);

        $publicToken = $body['publicToken'];
        $mode = $body['mode'];

        return [
            [
                'id' => 'snipcart_custom_gatway_1',
                'name' => 'Carte-Cadeau',
                'checkoutUrl' => get_home_url() . '/paiement-carte-cadeau'
            ]
        ];
    }

    public function order()
    {
        $this->authenticateRequest();

        $json = file_get_contents('php://input');
        $body = json_decode($json, true);

        $output = [
            'ordered' => []
        ];

        if (is_null($body) or !isset($body['eventName'])) {
            header('HTTP/1.1 400 Bad Request');
            return;
        }

        switch ($body['eventName']) {
            case 'order.completed':

                // We export the full order to the client invoice system (Retail Point)
                $this->exportJSON($body);

                $items = $body['content']['items'];
                $discounts = $body['content']['discounts'];

                // For every products, we update quantity available based on our inventory management, as we get full inventory once a day
                foreach ($items as $key => $item) {
                    $id = intval($item['id']);
                    $sold_today = get_field('sold_today', $id);
                    if ($sold_today === null) $sold_today = 0;
                    $out = [
                        'id' => $id,
                        'before' => $sold_today
                    ];
                    $sold_today += $item['quantity'];
                    $out['after'] = $sold_today;
                    update_field('sold_today', $sold_today, $id);
                    $output['ordered'][] = $out;
                }

                // We update gift cards amount based on discount codes
                $giftcard = new Giftcard;
                foreach ($discounts as $key => $discount) {
                    $card = $giftcard->find($discount['code']);
                    if ($card !== false) {
                        $amount = $discount['amount'];
                        $itemsTotal = $body['content']['itemsTotal'];
                        $updatedAmount = $amount - $itemsTotal;
                        if ($updatedAmount<0) $updatedAmount=0;
                        $giftcard->update($card, $updatedAmount);
                    }
                }

                break;
        }
        return $output;
    }

    public function shipping()
    {
        $this->authenticateRequest();

        $snipcart = json_decode(file_get_contents('php://input'), true);

        $rates = [];
        $free = false;

        // Give free shipping on order's total amount requirements and province
        if (isset($snipcart["content"]) && $snipcart["content"]['shippingAddressProvince']=='QC' && $snipcart["content"]['subtotal'] >= 74) {
            $rates[] = [
                'cost' => 0,
                'description' => 'Livraison gratuite au Québec en haut de 74$'
            ];
            $free = true;
        }else if (isset($snipcart["content"]) && $snipcart["content"]['shippingAddressProvince']!='QC' && $snipcart["content"]['subtotal'] > 199) {
            $rates[] = [
                'cost' => 0,
                'description' => 'Livraison gratuite en haut de 199$'
            ];
            $free = true;
        }

        $total = 0;
        foreach ($snipcart["content"]['items'] as $item) {
            $total += $item['quantity'];
        }

        // If no free shipping available, give Purolator options based on fixed amount by the client
        if (!$free && isset($snipcart["content"]) && $snipcart["content"]['shippingAddressProvince']=='QC') {
            if ($total < 3) {
                $rates[] = [
                    'cost' => 9,
                    'description' => 'Purolator'
                ];
            } else if ($total < 5) {
                $rates[] = [
                    'cost' => 12,
                    'description' => 'Purolator'
                ];
            } else {
                $rates[] = [
                    'cost' => 15,
                    'description' => 'Purolator'
                ];
            }
        } else if (!$free) {
            $rates[] = [
                'cost' => 25,
                'description' => 'Purolator'
            ];
        }

        // Add local pickup to shipping options
        $rates[] = [
                'cost' => 0,
                'description' => 'Ramassage en magasin chez Caron Chaussures - Trois-Rivières'
        ];
        $rates[] = [
                'cost' => 0,
                'description' => 'Ramassage en magasin chez Caron Chaussures - Sherbrooke'
        ];
        $rates[] = [
                'cost' => 0,
                'description' => 'Ramassage en magasin chez Chaussures Gaïa – Cap-de-la-Madeleine'
        ];
        $rates[] = [
                'cost' => 0,
                'description' => 'Ramassage en magasin chez Chaussures Gaïa - Trois-Rivières-Ouest'
        ];

        return [
            'rates' => $rates
        ];
    }
}

new Product;