The @PBX app is meant to be a multi-user app. So there is no ability to cache the logon information at the printer. You could try to simplify the login using express codes (unique numeric code per submission). This will let you enter just a single numeric code. But you will have rember/recall to code per job. You could enable printer authentication as an alternative, which would let you log into the printer via a badge/card, manually entered PIN, manual credential entry, or mobile phone unlock.
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