adding post create order

src/main/java/com/mercadopago/client/order/OrderCategoryDescriptorRequest.java

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+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderCategoryDescriptorRequest class. */
+@Getter
+public class OrderCategoryDescriptorRequest {
+
+    /** Event date. */
+    private String eventDate;
+
+    /** Passenger information. */
+    private OrderPassengerRequest passenger;
+
+    /** Route information. */
+    private OrderRouteRequest route;
+}
+

src/main/java/com/mercadopago/client/order/OrderClient.java

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+package com.mercadopago.client.order;
+
+import com.mercadopago.MercadoPagoConfig;
+import com.mercadopago.client.MercadoPagoClient;
+import com.mercadopago.core.MPRequestOptions;
+import com.mercadopago.exceptions.MPApiException;
+import com.mercadopago.exceptions.MPException;
+import com.mercadopago.net.HttpMethod;
+import com.mercadopago.net.MPHttpClient;
+import com.mercadopago.net.MPRequest;
+import com.mercadopago.net.MPResponse;
+import com.mercadopago.resources.order.Order;
+import com.mercadopago.serialization.Serializer;
+
+import java.util.logging.Logger;
+import java.util.logging.StreamHandler;
+
+import static com.mercadopago.MercadoPagoConfig.getStreamHandler;
+
+/** Client that use the Order API */
+public class OrderClient extends MercadoPagoClient {
+    private static final Logger LOGGER = Logger.getLogger(OrderClient.class.getName());
+
+    /** Default constructor. Uses the default http client used by the SDK. */
+    public OrderClient() {
+        this(MercadoPagoConfig.getHttpClient());
+    }
+
+    /**
+     * MercadoPagoClient constructor.
+     *
+     * @param httpClient http client
+     */
+    public OrderClient(MPHttpClient httpClient) {
+        super(httpClient);
+        StreamHandler streamHandler = getStreamHandler();
+        streamHandler.setLevel(MercadoPagoConfig.getLoggingLevel());
+        LOGGER.addHandler(streamHandler);
+        LOGGER.setLevel(MercadoPagoConfig.getLoggingLevel());
+    }
+
+    /**
+     * Method responsible for creating order with request options
+     *
+     * @param request request
+     * @param requestOptions metadata to customize the request
+     * @return order response
+     * @throws MPException an error if the request fails
+     * @throws MPApiException an error if the request fails
+     */
+    public Order create(OrderCreateRequest request, MPRequestOptions requestOptions)
+            throws MPException, MPApiException {
+        LOGGER.info("Sending order creation request");
+
+        MPRequest mpRequest = MPRequest.builder()
+                .uri("/v1/orders")
+                .method(HttpMethod.POST)
+                .payload(Serializer.serializeToJson(request))
+                .build();
+
+        MPResponse response = send(mpRequest, requestOptions);
+        Order result = Serializer.deserializeFromJson(Order.class, response.getContent());
+        result.setResponse(response);
+
+        return result;
+    }
+
+    /**
+     * Method responsible for creating order with request options
+     *
+     * @param request request
+     * @return order response
+     * @throws MPException an error if the request fails
+     * @throws MPApiException an error if the request fails
+     */
+    public Order create(OrderCreateRequest request) throws MPException, MPApiException {
+        return this.create(request, null);
+    }
+
+}

src/main/java/com/mercadopago/client/order/OrderCouponRequest.java

@@ -0,0 +1,13 @@
+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderCouponRequest class. */
+@Getter
+public class OrderCouponRequest {
+    /** Coupon code. */
+    private String code;
+
+    /** Amount of the coupon discount. */
+    private String amount;
+}

src/main/java/com/mercadopago/client/order/OrderCreateRequest.java

@@ -0,0 +1,63 @@
+package com.mercadopago.client.order;
+
+import com.mercadopago.net.MPResource;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.util.List;
+
+/** Order class. */
+@Builder
+@Getter
+public class OrderCreateRequest extends MPResource {
+    /** Order type. */
+    private String type;
+
+    /** Total amount of the order. */
+    private String totalAmount;
+
+    /** Reference you can synchronize with your payment system. */
+    private String externalReference;
+
+    /** Order type configuration. */
+    private OrderTypeConfigRequest typeConfig;
+
+    /** Order transaction information. */
+    private OrderTransactionRequest transactions;
+
+    /** Currency information. */
+    private String currency;
+
+    /** Configures which processing modes to use. */
+    private String processingMode;
+
+    /** Description of the order. */
+    private String description;
+
+    /** Payer's information. */
+    private OrderPayerRequest payer;
+
+    /** Origin of the payment. */
+    private String marketplace;
+
+    /** Fee collected by a marketplace or MercadoPago Application. */
+    private String marketplaceFee;
+
+    /** Discount campaign ID. */
+    private String campaignId;
+
+    /** Items information. */
+    private List<OrderItemRequest> items;
+
+    /** Coupon information. */
+    private OrderCouponRequest coupon;
+
+    /** Information's about split payments. */
+    private List<OrderSplitRequest> splits;
+
+    /** Shipping information. */
+    private OrderShipmentRequest shipment;
+
+    /** Expiration time of the order. */
+    private String expirationTime;
+}

src/main/java/com/mercadopago/client/order/OrderItemRequest.java

@@ -0,0 +1,35 @@
+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderItemRequest class. */
+@Getter
+public class OrderItemRequest {
+
+    /** Title of the item. */
+    private String title;
+
+    /** Unit price of the item. */
+    private String unitPrice;
+
+    /** Quantity of the item. */
+    private int quantity;
+
+    /** Description of the item. */
+    private String description;
+
+    /** Code of the item. */
+    private String code;
+
+    /** Type of the item. */
+    private String type;
+
+    /** Picture URL of the item. */
+    private String pictureUrl;
+
+    /** True if you purchase the item with warranty, false if not. */
+    private Boolean warranty;
+
+    /** Category Descriptor information */
+    private OrderCategoryDescriptorRequest categoryDescriptor;
+}

src/main/java/com/mercadopago/client/order/OrderPassengerRequest.java

@@ -0,0 +1,20 @@
+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderPassengerRequest class. */
+@Getter
+public class OrderPassengerRequest {
+
+    /** Passenger first name. */
+    private String firstName;
+
+    /** Passenger last name. */
+    private String lastName;
+
+    /** Passenger identification type. */
+    private String identificationType;
+
+    /** Passenger identification number. */
+    private String identificationNumber;
+}

src/main/java/com/mercadopago/client/order/OrderPayerRequest.java

@@ -0,0 +1,49 @@
+package com.mercadopago.client.order;
+
+import com.mercadopago.resources.common.Address;
+import com.mercadopago.resources.common.Identification;
+import com.mercadopago.resources.common.Phone;
+import lombok.Builder;
+import lombok.Getter;
+
+/** OrderPayerRequest class. */
+@Getter
+@Builder
+public class OrderPayerRequest {
+
+    /** Payer's email. */
+    private String email;
+
+    /** Payer's first name. */
+    private String firstName;
+
+    /** Payer's last name. */
+    private String lastName;
+
+    /** Identification information. */
+    private Identification identification;
+
+    /** Phone information. */
+    private Phone phone;
+
+    /** Address information. */
+    private Address address;
+
+    /** Type of authentication. */
+    private String authenticationType;
+
+    /** Date of registration. */
+    private String registrationDate;
+
+    /** Date of last purchase. */
+    private String lastPurchase;
+
+    /** If payer is prime user. */
+    private Boolean isPrimeUser;
+
+    /** If is first online purchase. */
+    private Boolean isFirstPurchaseOnline;
+
+    /** Payer's entity type. */
+    private String entityType;
+}

src/main/java/com/mercadopago/client/order/OrderPaymentMethodRequest.java

@@ -0,0 +1,28 @@
+package com.mercadopago.client.order;
+
+import lombok.Builder;
+import lombok.Getter;
+
+/** OrderPaymentMethodCreateRequest class. */
+@Getter
+@Builder
+public class OrderPaymentMethodRequest {
+
+    /** Payment method ID. */
+    private String id;
+
+    /** Payment method type. */
+    private String type;
+
+    /** Payment method token. */
+    private String token;
+
+    /** Number of installments. */
+    private int installments;
+
+    /** Payment method issuer. */
+    private String issuerId;
+
+    /** How will look the payment in the card bill (e.g.: MERCADOPAGO).  */
+    private String statementDescriptor;
+}

src/main/java/com/mercadopago/client/order/OrderPaymentRequest.java

@@ -0,0 +1,19 @@
+package com.mercadopago.client.order;
+
+import lombok.Builder;
+import lombok.Getter;
+
+/** OrderPaymentCreateRequest class. */
+@Getter
+@Builder
+public class OrderPaymentRequest {
+
+    /** Payment amount. */
+    private String amount;
+
+    /** Payment currency. */
+    private String currency;
+
+    /** Payment method information. */
+    private OrderPaymentMethodRequest paymentMethod;
+}

src/main/java/com/mercadopago/client/order/OrderReceiverAddressRequest.java

@@ -0,0 +1,29 @@
+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderReceiverAddressRequest class. */
+@Getter
+public class OrderReceiverAddressRequest {
+
+    /** Street name. */
+    private String streetName;
+
+    /** Street number. */
+    private String streetNumber;
+
+    /** Zip code. */
+    private String zipCode;
+
+    /** City name. */
+    private String cityName;
+
+    /** State name. */
+    private String stateName;
+
+    /** Floor. */
+    private String floor;
+
+    /** Apartment. */
+    private String apartment;
+}

src/main/java/com/mercadopago/client/order/OrderRouteRequest.java

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+package com.mercadopago.client.order;
+
+import lombok.Getter;
+
+/** OrderRouteRequest class. */
+@Getter
+public class OrderRouteRequest {
+
+    /** Departure city. */
+    private String departure;
+
+    /** Destination city. */
+    private String destination;
+
+    /** Departure date and time. */
+    private String departureDateTime;
+
+    /** Arrival date and time. */
+    private String arrivalDateTime;
+
+    /** Company name. */
+    private String company;
+}