Initial step: Access the Royal Mail developer portal by logging in.
Please proceed to the Royal Mail developer portal and locate the My Apps section.
In that section, you will find the apps you've created. If you haven't created any apps yet, please proceed to create an app.
after creating App, You will get Client Id and Client Secret, The Client Secret will only be displayed here one time. Please copy your Client Secret and keep it for your records.
You can see you created app like this:
Next, select the app you've created.
Proceed to the Subscriptions tab within your app. Here, you'll find the Product subscriptions option. If you have subscribed to any products from the Royal Mail API, you'll see your subscriptions listed. If you haven't subscribed to any products yet, click on "Why not browse the available APIs?"
Then select the below option
Select a plan from the list, and once you've made your selection, opt for your created app.
In your TrackShip account dashboard, navigate to Account > Carrier accounts and add the following information to the Royal mail
Client Id
Client Secret