can i assign IP and port with self signed SSL certificate

It has to be a public endpoint and you can authenticate incoming data as mentioned here. I am afraid we can't send any additional information while sending postbacks.

if(i[order_id]==ce_sell_order_id) and (i[status]=="COMPLETE"): #check for order completion status also, then go for placing a Sl-M order.

@amitk,

https://defuse.ca/checksums.htm#checksums