Is this also supported in Apple Pay (& Google Pay)?

You might be OK; "“Excluded Payment Method” means payments using fuel cards, including, BP Plus Cards, Motor Pass Cards, Motor Charge Cards, Fleet Cards, Distributor / Reseller Fuel Cards and any other payment methods as updated from time to time."

Any purchases made - either from your linked credit card or store credit.(so yes, 20% off iTunes cards are brilliant, and then get points again when you purchase on ITunes with these affiliate links) Works on anything inside iTunes - the App Store, Music, Movies, TV Shows etc..

1) Telstra does charge the credit card fee for payments made using Australia Post (including the Digital Mailbox)Appears as 'Credit Card Payment Processing Fee' on my Telstra Bill.