I do not use the app but in the web page (which I believe is the same).
You select billing.
You should see a list of Bill History.
Next to the words Bill History, you will see Transaction history
Select that and you will see your transaction history.
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Hi @Deidrem @NeilC
Unfortunately the app doesn't currently have the same "Transaction History" feature as the My Account web page. We plan to add it in future, but can't give a timeframe at this stage.