Paypal and Lambda

I have an application running in lambda which runs as a service for customers. I want to monetize this service using paypal but i also want to manage it as a monthly subscription service. I require a lambda function to perform the following task. I would prefer it written in Python using the requests library but this is a semi flexible requirement if there's good enough reason to use something different. function - on event, when there is a successful completed payment in paypal, retrieve the transaction details and post to a dynamo DB table (new transaction table) If this can be done then there may be more work for the freelancer. I'm a coder myself and have written my application but struggling with the paypal aspect