All purchases combined, you must spend at least €100.01!
You can request a refund on smaller purchases, e.g. €20, €40 etc., as long as the sum of all your purchases exceeds €100.01.
For example, you could buy €20 at Fnac, €50 at Decathlon and €40 at Carrefour - the total would then be over €100.01 and you could claim your money back!