Updating Satchmo/Django store to SHA-256 and G5 Root Certificate

[jc]

I have a Satchmo/Django e-commerce store that I've sort of inherited. :/ The client got an email from PayPal recently stating that they will be updating fromm SHA-1 to SHA-256 and changing to a G5 Root Certificate as well. I will need to update the store (probably specifically the PayPal module?) before the change over. Looks like the app that was installed is named: payment.modules.paypal

Regardless, I need advice/help form  someone very familar with Satchmo or Django or both on how to update this as I'm somewhat clueless at the moment. If this is the wrong place to ask it would be great to know of where I can ask this. For what it's worth, I'm guessing all of the work will be done inside the folder named /satchmo/apps/payment/modules/paypal? Any and all help is appreciated.

Here is the link to the PayPal info: https://www.paypal-knowledge.com/infocenter/index?page=content&widgetview=true&ID=FAQ1766&viewlocale=en_US