The ceddcf_after_checkout_action action is run immediately after the customer input is saved to the order's post meta. The action receives one argument, the $payment_meta, which contains all of the meta data for the order.

It can be used in the following manner:

add_action( 'ceddcf_after_checkout_action', 'my_custom_function' );
function my_custom_function( $payment_meta ){
	// Do something with the payment meta here