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I have added a new custom attribute for order in sales_order table. It contains a value for the order.

I have added extension_attributes.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Sales\Api\Data\OrderInterface">
        <attribute code="custom_order_no" type="string">           
        </attribute>
    </extension_attributes>
</config>

File Company\Mymodule\Api\Data\MyModuleInterface.php

namespace Company\Mymodule\Api\Data;

    interface MymoduleInterface extends \Magento\Framework\Api\CustomAttributesDataInterface
    {
        public function getCustomOrderNo();

        public function setCustomOrderNo($custom_order_no);

        public function getExtensionAttributes();

        public function setExtensionAttributes();
    }

If I retrieve the order with /rest/V1/orders/4 REST api call, the custom attribute is not getting displayed

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