To get the data you need to go to https://developer.paypal.com/ and enter your login and password:
Next you need to go to the control panel:
Select the section "Accounts" in the menu "Sandbox" and click "Create Account":
In the menu, select the account creation:
Country - Russia
Account Type - Buisness
Specify whether to consider this account is confirmed by the bank.
Also, enter the type of card.
This account is only necessary to create an application, all the data you can think of.
After this step, go to "My apps & Credentials", go down to the subsection "REST API Apps" and click "Create App":
The applications create a menu to select a previously created account, and enter the name of the application.
Then click "Create App":
After that, go to the "Live" mode of your application:
In this menu, you will see Client id of your application, which should be copied to the Control Panel application Mobium.
To display the Secret click "Show":
After pressing the "Show" you will see a Secret, which also should be copied to the control panel Mobium applications.
At the creation of Secret and Client id is completed.