It is an elegant feature of the Cost Calculator Pro that a well-spread PayPal payment gateway can be used. Enable the radio button to make PayPal functions available from Calculator Settings > PayPal.
In the Paypal option fields, you should insert the following fields:
3. Live or Sandbox -a testing environment that simulates the live PayPal production environment.
Click "Save" to save your settings.
The PayPal can be configured and settings can be applied globally through Dashboard > Settings > PayPal:
When PayPal is configured globally through settings and "Apply for all calculators" is enabled the settings will be applied for all created calculators, and there will be a notice when you edit the settings individually.