public function declareRoutes(WordPressRouteCollector $r) {
        // REST handlers
        $coupon = new API\Coupon();
        $fees = new API\Fees();
        $points = new API\Points();
        $deliverym = new API\DeliveryMethod();
        $register = new API\RegisterWithAmazon();
        $syncaccount = new API\SyncAmazonAccount();
        $settlementInfo = new Admin\API\SettlementInfo($this->module);
        $refund = new Admin\API\Refund($this->module);
        $capture = new Admin\API\Capture($this->module);
        $cancel = new Admin\API\Cancel($this->module);
        $ipn = new Admin\API\IPN($this->module);
        $linkmember = new API\LinkMembersToAmazon();

        // route guards
        $routeGuards = new RestRouteGuards($this->module);

        // middleware
        $middleware = new Middleware();
        $adminMiddleware = new Admin\API\Middleware($this->module);

        // REST admin editor wc_management routes
        $r->add(
            'POST',
            '/admin/getSettlementInfo/{orderId}',
            [$settlementInfo, 'get'],
            [$adminMiddleware->isOrderAssociated()],
            [],
            ['administrator', 'editor', 'wc_management']
        );
        $r->add(
            'POST',
            '/admin/refund/{orderId}/{refundAmount}',
            [$refund, 'post'],
            [$adminMiddleware->isOrderAssociated()],
            [],
            ['administrator', 'editor', 'wc_management']
        );
        $r->add(
            'POST',
            '/admin/capture/{orderId}/{captureAmount}',
            [$capture, 'post'],
            [$adminMiddleware->isOrderAssociated()],
            [],
            ['administrator', 'editor', 'wc_management']
        );
        $r->add(
            'POST',
            '/admin/cancel/{orderId}',
            [$cancel, 'delete'],
            [$adminMiddleware->isOrderAssociated()],
            [],
            ['administrator', 'editor', 'wc_management']
        );
        $r->addAdministratorRoute('POST', '/admin/registerIPNEndpoint', [$ipn, 'register']);

        // REST public routes
        $r->post('/member/updateAmazonLoginOption/{sync:[0-1]}', [$syncaccount, 'updateSyncMeta']);
        $r->post('/useCoupon', [$coupon, 'useCoupon'], [$middleware->updateWelcartEntries()]);
        $r->post('/resetCoupon', [$coupon, 'resetCoupon'], [$middleware->updateWelcartEntries()]);
        $r->post('/usePoints', [$points, 'usePoints'], [$middleware->updateWelcartEntries()]);
        $r->post('/updateFees', [$fees, 'updateFees'], [$middleware->updateWelcartEntries()]);
        $r->post('/updateDeliveryMethod', [$deliverym, 'update'], [$routeGuards->deliveryMethodCheck()]);

        $authAndCapture = API\CheckoutSession\Update::$authorizeWithCapture;
        $authOnly = API\CheckoutSession\Update::$authorize;
        $paymentIntent = $this->module->captureOnPurchase() ? $authAndCapture : $authOnly;

        // normal Welcart checkout
        $r->addGroup('/checkout/welcart', function (WordPressRouteCollector $r) use ($middleware, $routeGuards, $paymentIntent) {
            $payAndShipOnce = new API\CheckoutSession\Create(
                $this->module,
                $this->module->redirectRoutes->createPublicQueryUrl(
                    '/checkout/welcart/payandship/once/review',
                    USCES_CART_URL,
                    ['confirm' => 1]
                )
            );
            $payOnlyOnce = new API\CheckoutSession\Create(
                $this->module,
                $this->module->redirectRoutes->createPublicQueryUrl(
                    '/checkout/welcart/payonly/once/review',
                    USCES_CART_URL,
                    ['confirm' => 1]
                )
            );
            $cartUpdate = new API\CheckoutSession\Update(
                $this->module,
                add_query_arg(['wcexaapCompletePurchase' => 1], USCES_CART_URL),
                false,
                $paymentIntent
            );
            $r->post('/payandship/once/createSession', [$payAndShipOnce, 'post']);
            $r->post('/payonly/once/createSession', [$payOnlyOnce, 'post']);
            $r->post(
                '/payandship/once/updateSession/{id}',
                function (array $args) use ($cartUpdate) {
                    $cartUpdate->setSettlementType('payandship');
                    return $cartUpdate->patch($args);
                },
                [
                    $middleware->updateWelcartEntries(),
                    $routeGuards->cartNotEmptyCheck(),
                    $routeGuards->itemsInStockCheck(),
                    $routeGuards->addressCheck(),
                ],
                [$middleware->saveOrderActingData()]
            );
            $r->post(
                '/payonly/once/updateSession/{id}',
                function (array $args) use ($cartUpdate) {
                    $cartUpdate->setSettlementType('payonly');
                    return $cartUpdate->patch($args);
                },
                [
                    $middleware->updateWelcartEntries(),
                    $routeGuards->cartNotEmptyCheck(),
                    $routeGuards->itemsInStockCheck(),
                ],
                [$middleware->saveOrderActingData()]
            );
        });

        // QuickPay checkout
        $r->addGroup('/checkout/quickpay', function (WordPressRouteCollector $r) use (
            $middleware,
            $routeGuards,
            $paymentIntent,
            $register,
            $linkmember
        ) {
            $payAndShipOnce = new API\CheckoutSession\Create(
                $this->module,
                $this->module->redirectRoutes->createPublicQueryUrl(
                    '/checkout/quickpay/payandship/once/review',
                    USCES_CART_URL
                )
            );
            $payOnlyOnce = new API\CheckoutSession\Create(
                $this->module,
                $this->module->redirectRoutes->createPublicQueryUrl(
                    '/checkout/quickpay/payonly/once/review',
                    USCES_CART_URL
                )
            );
            $cartUpdate = new API\CheckoutSession\Update(
                $this->module,
                add_query_arg(['wcexaapCompletePurchase' => 1], USCES_CART_URL),
                false,
                $paymentIntent
            );
            $r->post('/payandship/once/createSession', [$payAndShipOnce, 'post']);
            $r->post('/payonly/once/createSession', [$payOnlyOnce, 'post']);
            $r->post(
                '/payandship/once/updateSession/{id}',
                function (array $args) use ($cartUpdate) {
                    $cartUpdate->setSettlementType('payandship');
                    return $cartUpdate->patch($args);
                },
                [
                    $middleware->updateWelcartEntries(),
                    $routeGuards->cartNotEmptyCheck(),
                    $routeGuards->itemsInStockCheck(),
                    $routeGuards->deliveryMethodCheck(),
                    $routeGuards->addressCheck(),
                    $routeGuards->giftShippingCustomerAddressCheck(),
                    $routeGuards->customFieldsCheck(),
                    $register->registerNewMemberIfRequired(),
                    $register->setOrderGetPointIfNewMember(),
                    $linkmember->saveLinkWithYourAmazonAccount(),
                ],
                [$middleware->saveOrderActingData()]
            );
            $r->post(
                '/payonly/once/updateSession/{id}',
                function (array $args) use ($cartUpdate) {
                    $cartUpdate->setSettlementType('payonly');
                    return $cartUpdate->patch($args);
                },
                [
                    $middleware->updateWelcartEntries(),
                    $routeGuards->cartNotEmptyCheck(),
                    $routeGuards->itemsInStockCheck(),
                    $routeGuards->customOrderFieldsCheck(),
                    $linkmember->saveLinkWithYourAmazonAccount(),
                ],
                [$middleware->saveOrderActingData()]
            );
        });
    }