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Hi, We need PayPal expert with experience in subscriptions.
When customer pay for our desktop application he need to get license on email to use this application.
Every time when user start application, application will check if license is still valid (that mean application need to have access to some database of licenses which is connected with PayPal subscriptions). Also, if is possible, it will be good that user get private username and password to login in membership area of our WordPress website.