How can I (or can I even) transfer iTunes/App store credit from one Apple ID to another?
101401
Can I transfer iTunes credit between accounts?
106195
Can't install any app, App Store asks for credit card
117859
How do I copy music to my iPhone using iTunes 11?
45820
Unable to change payment information to NONE in iOS Appstore
79440
Mac App Store, reuse apps after changing country
87634
What happens to my purchased music if I cancelled my Apple Music subscription?
72649
How do I transfer a file from a guest account on a MacBook Air?
147731
How can I tell which Apple ID has signed/purchased specific apps on iOS?
108228
How do I transfer a single app with data from one iPhone to another?
71224
How can I find my Apple ID on my iPad?
112225
Can you play Clash of Clans using the same Apple ID?
93917
How to download past purchases from old Apple ID without waiting 90 days to switch back to new Apple ID?
23032
Why won't my secondhand iPad let me activate an Apple ID?
49120
How do you use an existing AppleID on iOS App Store without providing a credit card number?
128581
Can I copy (myself) an app purchased through the Mac App Store to another of my licensed computers?
124669
Can I increase my credit limit by transferring money to my Credit Card account?
98674
Can I update an Mac App purchased by a different Apple ID?