Hi all. Just saw the info below about HANDOVER PROTOCOL - and primary and secondary receiver roles.
FB Business Manager->Page->Settings ->Messenger Platform->Subscribed Apps section
“The apps that are currently subscribing to your page and their information will be listed here. Note that setting up the Primary Receiver and Secondary Receiver roles will trigger Handover Protocol. Please make sure the apps can support the protocol before setting up the roles.”
Does anyone know if there is any documentation?