This gist gives a high level overview of how to create an order in Square using the PHP SDK. For an order to show in the Dashboard you must create, fulfill AND pay for the order.

create-order-square-php-sdk.php

        $body = new \Square\Models\CreateOrderRequest;
        
        //Add 5 of the same line items
        //We are creating them dynamically
        $qty = 5;
        $lineItem = new \Square\Models\OrderLineItem($qty);
        $lineItem->setName('Latte');
        $money = new \Square\Models\Money;
        $money->setCurrency('CAD');
        //Amount in Cents e.g. $5.50
        $money->setAmount(550);
        $lineItem->setBasePriceMoney($money);

        //You MUST set a location ID
        $order = new \Square\Models\Order($locationId->id);
        $order->setCustomerId($customer->id);
        $order->setLineItems([$lineItem]);

        //Set Fullfillment
        //You MUST set fulfillment!
        $fullfillment = new \Square\Models\OrderFulfillment;
        $fullfillment->setType('SHIPMENT');
        $fullfillment->setState('PROPOSED');

        //Add some demo details, they are not verified by Square
        $pickupDetails = new \Square\Models\OrderFulfillmentShipmentDetails;
        $pickupDetails->setShippingType('Express');
        $pickupDetails->setCarrier('UPS');

        //You must set the Shipment receiver with a valid Square customer
        $recipient = new \Square\Models\OrderFulfillmentRecipient;
        $recipient->setCustomerId($customer->id);

        $pickupDetails->setRecipient($recipient);

        $fullfillment->setShipmentDetails($pickupDetails);

        $order->setFulfillments([$fullfillment]);

        //Ready
        $body->setOrder($order);
        //Very important, you must set a unique key
        $body->setIdempotencyKey(uniqid());

        $ordersApi = $this->square->getOrdersApi();

        $apiResponse = $ordersApi->createOrder($locationId->id, $body);

        if ($apiResponse->isSuccess()) {

            $order = $apiResponse->getResult();

            $order = $order->getOrder();

            error_log('Square Order Creation::' . print_r($order, true));

            //Now, we MUST Pay for the Order
            //In the sandbox, you can use this demo source. 
            $body_sourceId = 'ccof:customer-card-id-ok';
            $body_idempotencyKey = uniqid();
            $body_amountMoney = new \Square\Models\Money;
            $body_amountMoney->setAmount($order->getTotalMoney()->getAmount());
            $body_amountMoney->setCurrency(\Square\Models\Currency::CAD);
            $body = new \Square\Models\CreatePaymentRequest(
                $body_sourceId,
                $body_idempotencyKey,
                $body_amountMoney
            );

            $body->setAutocomplete(true);
            $body->setCustomerId($customer->id);
            $body->setLocationId($locationId->id);
            $body->setOrderId($order->getId());

            $paymentsApi = $this->square->getPaymentsApi();

            $apiResponse = $paymentsApi->createPayment($body);

            error_log('Payment Response::' . print_r($apiResponse, true));

        } else {
            $errors = $apiResponse->getErrors();

            error_log('Errors for Square Order Creation::' . print_r($errors, true));
        }

        //End Order Creation