I've been getting this error code for about the last three days whenever I try to buy something. From Sony's Knowledge Base:
WC-40355-7 Error Code:
Issue adding funds to a sub account
Sub accounts do not have a wallet. Please add your funds from the Master Account linked to the sub account.
This is so whether I try to buy on the PS3, PS4, Vita, or the web-based store, except in the web-based store, it just says that there was an error, no error codes. The weird thing is that I don't even have any sub accounts, only the main one. This is really starting to get frustrating, especially with the current Flash Sale. Does anyone know anything about this, or does Sony just not want my money? Thanks in advance.