jbranchaud/sks 90 replace remaining calls to stripedata with getpurchaseinfo

[jbranchaud]

This removes remaining calls to stripeData (and removes stripeData itself) and moves the purchaseType logic up into the getPurchaseInfo function so that we don't have to do a separate function call that fires off excess network requests.

• feat: extract stripe-specific function
• feat: pull stripe pieces up into outer method
• feat: include purchase type info in info
• feat: fully replace determinePurchaseTypeViaStripe
• feat: finally remove stripeData function