Need applescript for Messages to send Passbook .pkpass attachments

Hi - I'm trying to write an applescript to send iMessages to a list of recipient Phone numbers with Passbook .pkpass files as attachments.

Here's my simple sendMessage.applescript file

on run {targetBuddyPhone, targetMessage, targetFile}

tell application "Messages"

set targetService to 1st service whose service type = iMessage

set targetBuddy to buddytargetBuddyPhone of targetService

sendtargetMessagetotargetBuddy

sendfiletargetFiletotargetBuddy

end tell

end run

I'm calling this from Terminal with command:

osascript sendMessage.applescript <Phonenumber> "Here's your Passbook coupon" Coupon.pkpass

When I execute the command, my targetMessage is correctly sent. However, the .pkpass file transfer says it is waiting for the recipient to accept the file transfer.

When I send it to my own iPhone, I don't receive any request to accept a file transfer.

How can I modify this script such that the file is properly attached to the iMessage and it sends with an auto-accept condition ?

Thanks if you can help,

Andrew