Payment processing domain service methods

fetchBorrowerKeysAndNames() is the first method referenced in the view logic. This method is found in the biglittle.domain.user.UserService class. Its purpose is to return a list of documents containing the values of the _id, userKey, and name fields. This list is subsequently used in the view template to provide a drop-down list from which the loan administrator can choose. Here is that method:

    def fetchBorrowerKeysAndNames(self) :
        keysAndNames = []
        lookup = self.collection.find({'userType':'borrower'})
        for borrower in lookup :
            doc = {
                'id'   : borrower.getId(),
                'key'  : borrower.getKey(),
                'name' : borrower.getFullName()
            }
            keysAndNames.append(doc)
        return keysAndNames

Another method used during payment acceptance is fetchUserByBorrowerKey(), found in the same class. Its purpose is to return...