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/usr/bin/purple-send is in libpurple-bin 1:2.10.9-0ubuntu3.

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The actual contents of the file can be viewed below.

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#!/bin/sh

METHOD_NAME=$1

if test -z "$METHOD_NAME" 
then
    cat <<EOF 
This program calls purple API functions using DBus and prints the return value.
If you are not interested in the return value, use purple-send-async.

Usage:

   $0 method-name type1:parameter1 type2:parameter2 ...

This shell script just invokes dbus-send, see man dbus-send for how 
to specify the parameters.  

Examples:

   $0 PurpleAccountsFindConnected string: string:prpl-jabber
   $0 PurpleAccountsGetAll
   $0 PurpleCoreQuit

Use dbus-viewer to get the list of supported functions and their parameters.
EOF
    exit 1
fi

shift
dbus-send --dest=im.pidgin.purple.PurpleService --print-reply --type=method_call /im/pidgin/purple/PurpleObject im.pidgin.purple.PurpleInterface.$METHOD_NAME "$@"