I haven't received an invoice after purchasing themeTumblr handle all payments for themes, please email firstname.lastname@example.org and they will sort out an invoice for your theme purchase.
This could be for several reasons, but the most common is that you have your Soundcloud username incorrect. The username is what is found in the URL of your Soundcloud profile.
My Soundcloud player isn't working
For example, if the URL to your Soundcloud profile is:
Then your Soundcloud Username is:
If your Soundcloud player still isn't working, also make sure that your tracks are set to be able to be accessed via the API. To check this - go to the edit page of your track, then down the bottom under "advanced" settings make sure it is "apps enabled".