Clients never have login credentials to their stuff, do they?

Welcome to devRant. They don't save it anywhere. If the client has account on their website they will reset the password every-time they want to login.

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Never.
As a rule, clients are morons.

In this predicament now. Boss gave me credentials to the wordpress login, but not the cPanel itself. I asked about it and he said he already gave me everything i need and i could tell he wasnt interested in hearing i didn't use wordpress and i needed another set of login cred. (Which im positive he has forgotten)