Update django website to comply with paypal security updates

General information for the website: Mountain bike coaching + booking
Kind of development: Customization of existing website
Description of requirements/features: We are having some issues with an existing project and looking for someone to do some updates on it.

We are particularly looking for someone who would feel comfortable working with an existing platform and who has previous experience with e-commerce functionality. We urgently need to update SSL certificates and other security integrations as per Paypal's recent updates. (https://devblog.paypal.com/upcoming-security-changes-notice/). Issues are related to Paypal IPN, and the communication between our site and paypal.

Do you think this is something you would be interested in undertaking? If so, what information would you need to provide a quote?
CMS and Admin requirements: Django, Python
Extra notes: