The register new PAYPAL Adaptive is hard, You should be done it before buying this module
See detail https://developer.paypal.com/docs/classic/adaptive-payments/integration-guide/APIntro/

Important: Adaptive Payments is now a limited release product. It is restricted to select partners for approved use cases and should not be used for new integrations without guidance from PayPal.

Adaptive Payments Actors and Objects
Adaptive payments handles payments between a sender of a payment and one or more receivers of the payment. You are an application owner, such as a merchant that owns a website, the owner of a widget on a social networking site, the provider of a payment application on mobile phones, and so on. Your application is the caller of Adaptive Payments API operations.
Paypal Adaptive is an Opencart payment extension, created exclusively for Opencart with these Features:

- Payment on site (Popup)

- Instantly show status after customer has paid

- PayPal Buyer Protection Claims

- Paypal email for each Manufacturer

- One order per manufacturer

- FREE 2 hours' support make it works

(Adaptive payments handles payments between a sender of a payment and one or more receivers of the payment. You are an application owner, such as a merchant that owns a website, the owner of a widget on a social networking site, the provider of a payment application on mobile phones, and so on. Your application is the caller of Adaptive Payments API operations.)
Source and Read More https://developer.paypal.com/docs/classic/adaptive-payments/integration-guide/APIntro/

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