Any legislation passed by the Parliament must have a majority of the MPs and indirectly, the majority of the voters participating in the last election.
This means there must be a proportional representation electoral system, which will allocate the mandates to the Parliament proportionally. Like in any parliament any act to be legislated will require the support of the majority of MPs. But the double majority principle would also require that the act gets the support of the majority of the voters. Read more about it here.
The initial position of the participants debating this issue can be found in this Report made on 20/5/2021. Click on Participants (bucketized) and Group outline to see how the participants were split into two Groups, the larger one with a minimum 60% agreeing with the specified proposals.