You can view the history of credits that have been added/removed your account by viewing the "History" tab in your Wallet 
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To view your credit History:
- Tap the Wallet icon in the top right corner (the gold coin icon with a number next to it)
- Tap the "History" tab
- Scroll down to view bonus credits that have been applied to your account by date
This tab will track all transactions to/from your account, including:
- credits received from purchases, both manually and using the Auto-refill option
- credits applied to your account by Support Agents,
- credits redeemed from Rewards
- credits redeemed from promotional codes
- credits spent on song plays and upgrades
- credits sent to or received from other users