This video explains how you setup and use Royal Mail Click and Drop with KCC. You will find step by step instructions below the video.
Please note that the video does not mention adding the Endpoint URL when configuring the courier. This must be added otherwise the integration will not work, see step 15 in the setup section below.
Pre-Setup
Before you begin the setup, make sure that you are logged into your KCC account.
Open System Setup – System Data.
Open the Couriersscreen and make sure that the Export Type for your Royal Mail service is RM Click & Drop Magento v2.
Open a new browser (internet) tab and start the setup.
Setup
Log into your Royal Mail Click & Drop account.
Click Settings.
Click Integrations .
Click Add New Integration button.
In the popup dialog box click Magento.
Select v2.x from the dropdown menu.
Click the Copy to Clipboard button at the end of of the Callback URL value.