dadonbike

Running:
Wordpress 3.9.2
Woocommerce 2.1.12

Open
class-wc-custom_payment_gateway_1

Add action at line 39 beneath other two actions
add_action( 'woocommerce_thankyou_wcCpg1', array( $this, 'thankyou' ) );

Instruction now appears on thankyou page