change the insertion of certain information in the header of the mail

[chellofr]

Hello everyone,

I try to change the insertion of certain information in the header of the mail client receives when placing an order:

 

Today, in the order confirmation that my client get is as follows:

[shop NTDA] Order Confirmation

 

I would like this:

[shop NTDA] Order Confirmation No SAERAKOIZ # 000046

 

SAERAKOIZ is the order number

# 000046 is the 46th order placed on the site.

 

So I must add the order number and serial number of orders placed.*

 

Can you help me ?