Hi @amc11,
To double-check, I added the {order_number}
to the “processing” email and placed a test order. The order number did appear in the subject line of my email. Here’s a screenshot.

Make sure the variable used is {order_number}
and try testing it again. If you still have trouble, please send over a screenshot of the settings of that email.
Thanks!
Thread Starter
amc11
(@amc11)
Hi,
Like I wrote its only for order invoice sent to customer. Not new order.
It works as well for me in the customer invoice email.

Just to clarify, this is not the variable {order_nummer}
. It needs to be {order_number}
instead. Here is a screenshot of the settings for comparison.

Thread Starter
amc11
(@amc11)
Haha! Im so sorry.
Yes its so true. I dont know how that happened. I guess I changed the text and
then wrote it wrong.
Thanks!!
I’m glad it’s working now 😄