Hi my icloud storage is not updated even after the payment is successful

Try re-starting your Mac or device (deletes temporary files, and may update your info.)

Eg: Restart your iPhone - Apple Support (on Mac : Apple Menu > Restart)

Else: If you still need help:

Try: Check your iCloud storage on iCloud.com - Apple Support

and

if you bought more storage but you still don't see it in your account — Contact - Official Apple Support."

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More info:

iCloud Support Website (info / support/ contact:

(There is a "Get Support" link (online chat, phone, eMail etc) at the bottom of their webpage (link below):

iCloud - Official Apple Support