NAME: the name is only used in the Purchasely console
ID: the id is what the developer will need to call in the app
DESCRIPTION: the description is only used in the Purchasely console and is meant to help for collaborative work.
PAYWALL: the paywall is the paywall that will be displayed when the Placement will be called in the app. This is where the magic is, you will be able to change the displayed Paywall for that Placement whenever you want without any further developer action.
presentationControllerwith an id.