The SubscriptionBoss WordPress Plugin integrates PayPal with Infusionsoft to allow you to take payment by PayPal for Subscriptions and payment plans with single or multiple payments.
The plugin is useful if you are using Infusionsoft as your Customer Management and Billing System and want to offer PayPal as a payment mechanism. This may be because people are more willing to buy subscriptions using PayPal than a credit card, or because it saves them foreign exchange charges. You may want to offer PayPal if your merchant account has not yet been approved.
For more see SubscriptionBoss Features