In default OpenCart after order place if customer is login or guest, just success message shows but invoice not shows.

This extension shows invoice along with order success message

Features:
i)Works for user login place.
ii)even works for guest order place.
iii)OCMOD extension, just plug and play
iv)Work for every kind of theme
Installation:
extract zip folder
upload catalog folder according to directory structure
login to admin > extension > extension installer > browse path to "invoice.ocmod.xml" file and install
admin > extensions > modifications > refresh

for testing
Place an order and check invoice will show at success page
DEMOhttp://www.dyisol.com/oc2302/index.php?route=common/home
Add item to cart and made checkout
dyisolco@gmail.com