When signed into the dashboard, under the section Payment Activity section there are 2 types of transactions you may see - received and rejected.

Received transaction are denoted with a green arrow, this means the payment was approved by the payer and the paying bank have confirmed they will complete the payment.  The other type where the status of the payment is rejected is denoted with a red cross which means although the payer did approve the payment, the paying bank have blocked it and so in this case the money will not be transferred into your bank account and you will need to ask your payer to retry.

The CSV file now includes an additional column 'Payment status' which shows received and rejected amounts