We are helping a client that has monthly subscribers move from Foxycart 0.7.1 to Foxycart 2.0. They have a lot of subscribers paying with a deprecated PAYPAL EXPRESS CHECKOUT payment option which Foxycart 2.0 does not support. We're not completely clear what the migration path is from 0.7.1 to 2.0 in regards to Paypal Express Checkout and what will happen in the switch over. Will the old accounts fail since they're not compatible? Is there a migration path/approach documented anywhere for this? The client has a large subscriber base and doesn't want to upset their client base during the switch over.