Three songs free when you join. Credits never expire. Every payment goes through Google Play, in your currency.
$59.99 a year
Renews until you cancel in Google Play. Unused songs do not carry over.
Every song is composed and sung by a music model that costs real money per song. Credits keep the price honest: you pay for songs you make, nothing else.
No. Pro's monthly songs refill each month and do not carry over; credits you bought stay until you use them.
The credit comes back by itself. A request the engine refuses (a real singer's voice, an existing song) is not charged either.
Not yet: every purchase is in the app through Google Play, which shows the price in your currency with taxes where required.