You can view bonus credits that have been applied to your account by Support Agents, earned from Loyalty rewards, or from promo codes that you've redeemed, by viewing the "Bonus history" tab in your Wallet 
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- Tap the Wallet icon in the top right corner (the gold coin icon with a number next to it)
- Tap the "Bonus history" tab
- Scroll down to view bonus credits that have been applied to your account by date