hi,
you usually need to allow 1 business day for your payment to be processed and subscription to start. in the meantime you can use a 7 day trial.
you can check your account to verify your subscription is what you expect and to verify your adobe id (used in the next step), https://accounts.adobe.com/
f your account shows
a. your subscription is active,
1. sign out and then back in to your cc desktop application using the same adobe id above to verify your subscription: http://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
2. if that fails, https://helpx.adobe.com/manage-account/kb/stop-creative-cloud-trial-mode-after-purchase.html
3. if that fails, https://helpx.adobe.com/creative-cloud/kb/cc-reverts-to-trial.html
4. if that fails, using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here and, when available, click 'chat', http://helpx.adobe.com/x-productkb/global/service-ccm.html
if your account shows
b. you have no subscription pending and you're payment has been processed:
1. using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here and, when available, click 'chat', http://helpx.adobe.com/x-productkb/global/service-ccm.html