Go to Royal Mail's "Click & Drop" platform and log in:

https://business.parcel.royalmail.com/

Go to Settings

Go to "Integrations"

Click "add a new integration"

Choose "Click & Drop API"

Set up integration name and save

Go back to integration settings and click status icon on your new integration.(Red means inactive)

Update and connect your integration

Now your integration is active and can be used in SoldEazy.

 Go to Channels > Shipping Channel

Click < Add a Shipping Channel >, choose Royal Mail "Click & Drop"

Input your Click & Drop account email and the API authorization key from your integration settings, save and done.