I had to ask google as its the weekend, but it says the following as to how to see your transaction history:
PS5:
- Go to Settings > Users and Accounts.
- Select Account > Payment and Subscriptions.
- Choose Transaction History and set your date range.
- Select the specific transaction for the Apex pack or coins to view your proof of purchase (Order Number and Transaction ID).
PS4:
- Go to Settings > Account Management > Account Information.
- Select Wallet > Transaction History.
- Choose the date range to locate your purchase.
Or there would be email reciepts for each transaction.