enrolment key not working

hi
we understand in the moodle enrolment method , "self-enrollment" method must be active to possible for joomdle to show the enrolment button for user in the joomla side...it's good and have not any problem.
but in the self-enrollment method we have the field called "enrollment key" and i want to use that. if my user has the code can enroll in the course can enroll to course with the enrolment key and if i don't set any enrolment key they can enrol in the course such as already...
i see some topic but it can't help me use the "go to course" button because i want the user must be enroll in the course.
Is there any other way instead of using hikashop and coupon for my goal?
tnx

> use the "go to course" button because i want the user must be enroll in the course.

You can use that. That way user is taken to course:
1) if he is enroled, goes to course
2) if not:
a) Course has enrolment key, fill it, and click enrol
b) Course has no key, just click enrol

Antonio Durán wrote: 2) if not:
a) Course has enrolment key, fill it, and click enrol
b) Course has no key, just click enrol

my problem in 2) b)
in this way, user must 2 click in 2 page for enroll to course. one in the joomla page and second in the moodle.
is there any way for that course that hasn't any enrollment key, directly enroll and go to course.

No, right now there is no way to avoid the 2 clicks.

if you say me what the file must be edited for this, i go to edit that or write the plugin for that if need.
i think it's simple if ...else . am i right?

No, I don't think it is simple. I think modifications to web services would be needed, as you need to know in Joomla if course has a enrolment key. Right now we don't have that info on Joomla side.