To get โฌ50 credited to your balance, you'd need to transfer at least โฌ2000 on your first transfer (unfortunately with all this money transfer, you can't test a small amount first to get the referral bonus, but the good news is they're quite reliable). CurrencyFair has 2 options, either you exchanged first (so you know the rate) or you'll ask them to use the market rate at the time the received get the money (usually a few hours later, which can be more or less, depending on the market fluctuation)
$15 AUD off and free first transfer for minimum of $300 AUD transfer (it's also 15/300 in NZD or GBP, but in their respective currency). The coupon will be listed on the last page before payment, but you'd have to select them manually to apply