What should I do if Diablo Immortal shop error code 1 appears for all in-game purchases?

If Diablo Immortal shop error code 1 affects all in-game purchases, it strongly suggests a systemic issue with your account's ability to process transactions. Double-check your payment details across all linked accounts (e.g., your Blizzard account, platform account). Contacting Blizzard support is the most direct way to diagnose and resolve this widespread problem.