Download the tcc Rewards+ app and sign up as a member to get a free welcome drink e-voucher (worth $9.50). If you're an existing member then you will get a 50% discount e-voucher.
Free Welcome Drink E-Voucher (Worth $9.50) or 50% off E-Voucher at The Coffee Connoisseur (Download tcc Rewards+ App)
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Lasts for a month from the time you complete registration. T&Cs "appear" to be strict (i.e. it suggests you can't change to something else) but who knows how strictly they'll enforce it.