This wonderful company is 0 for 2. ‘Inworp’ is just not an insertion – they mean ‘bigger coins’. This sentence needs a face-lift (a higher one).
Alternatives off the top of my coffee break: exact change not required, no change given.
‘No change given’ usually implies that a vending machine takes all coins and does not give change.
And there’s often a picture of the coins that are accepted like the Dutch train ticket vending machines have.
But why keep it simple when you can make it wordy? And I refuse to correct the sentence.