/// Getting a route for a keysend payment to a private node requires providing the payee's
/// features (since they were not announced in a node announcement). However, keysend payments
/// don't have an invoice to pull the payee's features from, so this method is provided for use in
/// Getting a route for a keysend payment to a private node requires providing the payee's
/// features (since they were not announced in a node announcement). However, keysend payments
/// don't have an invoice to pull the payee's features from, so this method is provided for use in