The comment about groups in etherpad-lite-client.php says:
// GROUPS
// Pads can belong to a group. There will always be public pads that doesnt belong to a group (or we give this group the id 0)
However, when attempting to do $instance->listPads("0") (or any other obvious variant, such as "g.0", "" or 0), it replies "groupID does not exist" instead of replying with a list of pads not belonging to any group.
The comment about groups in etherpad-lite-client.php says:
// GROUPS // Pads can belong to a group. There will always be public pads that doesnt belong to a group (or we give this group the id 0)
However, when attempting to do $instance->listPads("0") (or any other obvious variant, such as "g.0", "" or 0), it replies "groupID does not exist" instead of replying with a list of pads not belonging to any group.