The point here is that I'd like to change the parameter from:
to:|PM<group-SID> |Private message, <group-SID> is the SID clients must send responses to. This field must contain the originating SID if this is a normal private conversation.
Above format is also a way to make sure the structure is consistent (name followed by explanation).|PM |Private message. Specifies the SID that clients must send responses to ("reply-to SID"). For example, this will be the originating SID if this is a private conversation between two clients. A private message is typically shown distinct from normal messages.