At the moment, you only need one other person to accept your invite and buy together. The first user who completes their checkout via your invite link will be the person buying together with you.
After that, your invite link (and the Duo Deal price) is still available for anyone who has access to your link. In other words, any user clicking the link will be able to buy the deal with the Duo Deal price, using your invite. After they finish their checkout, their names will also be added to the list of users who take up your invite and buy together.
Please also note that since your Duo Deal invite is also featured in the deal’s details view, other Blidz users may take up your invite before your friends do. Still, you only need one person buying together to complete your Duo Deal order.
For more details and guidance, please refer to the official Duo Deal guide.