I am trying to upload multiple tracking numbers to an Amazon order using MWS API in PHP but don't know what would be the XML request for this. Here is the XML I am using which ends up uploading the last tracking number.
$feed = <<<EOD
<?xml version="1.0" encoding="UTF-8"?>
<AmazonEnvelope xsi:noNamespaceSchemaLocation="amzn-envelope.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Header>
<DocumentVersion>1.01</DocumentVersion>
<MerchantIdentifier>XXX</MerchantIdentifier>
</Header>
<MessageType>OrderFulfillment</MessageType>
<Message>
<MessageID>1</MessageID>
<OrderFulfillment>
<AmazonOrderID>$orderId</AmazonOrderID>
<FulfillmentDate>$FulfillmentDate</FulfillmentDate>
<FulfillmentData>
<CarrierCode>$carrierCode</CarrierCode>
<ShipperTrackingNumber>'1Z7X887R0370783509'</ShipperTrackingNumber>
</FulfillmentData>
<Item>
<Quantity>1</Quantity>
</Item>
</OrderFulfillment>
</Message>
<MessageID>2</MessageID>
<OrderFulfillment>
<AmazonOrderID>$orderId</AmazonOrderID>
<FulfillmentDate>$FulfillmentDate</FulfillmentDate>
<FulfillmentData>
<CarrierCode>$carrierCode</CarrierCode>
<ShipperTrackingNumber>'1Z7X887R0075127492'</ShipperTrackingNumber>
</FulfillmentData>
<Item>
<Quantity>1</Quantity>
</Item>
</OrderFulfillment>
</Message>
<MessageID>3</MessageID>
<OrderFulfillment>
<AmazonOrderID>$orderId</AmazonOrderID>
<FulfillmentDate>$FulfillmentDate</FulfillmentDate>
<FulfillmentData>
<CarrierCode>$carrierCode</CarrierCode>
<ShipperTrackingNumber>'1Z7X887R0375972085'</ShipperTrackingNumber>
</FulfillmentData>
<Item>
<Quantity>1</Quantity>
</Item>
</OrderFulfillment>
</Message>
</AmazonEnvelope>
EOD;
Any help is appreciated!