It looks like Decathlon has increased the referral bonus to $20 with a minimum $100 spend.
Previously it was $10 coupon with $70 min spend and $10 with $50 min spend (https://www.ozbargain.com.au/node/636312), so a slight improvement.
Link to page to get your referral code: https://decathlon.com.au/#smile-home
Link to promotion: https://decathlon.com.au/pages/give-20-get-20
Link to T&Cs: https://decathlon.com.au/pages/terms-and-conditions-membersh…
Note that the sign up bonus without referral has also been updated to $20 with $100 min spend.
it is same offer not big discount other website are giving better discount and options. so no to decathlon