Checking one page worked correctly a week ago, and now it is gone. I am undoubtedly to blame, because I still had a problem with the admin backend, and I probably somehow kept silent about this while working on it.
In any case, it happens that when the user (registered, registered) clicks the "Continue" button in the "Payment Information" step of checking one page, as if the button was not pressed. He does not proceed to the next step. And the error console (in Firefox) reports “TypeError: checkout is undefined” and it shows line 303 in opcheckout.js.
This problem is very similar to another hosted on SO , but (a) that there is no answer to it, and (b) I don’t have high enough to comment (or add to the question there).
While the solution would be great, I am also really trying to learn how to debug it myself. I have already applied many magento solutions that I found while searching on Google (for other problems), and although they work, and most importantly, I'm starting to want to be able to solve my own problems. And maybe even be able to help others in the long run ...
So, in this case, given that "checkout in undefined", how can I find where it should be defined?
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