The exact meaning of endorse can depend upon its context. For example:
"I endorse her candidacy." — support for a candidate
"I endorse the committee's recommendations." — support an idea
"She is paid a million dollars a year to endorse the company's products." — publicly support in return for payment
"She endorsed and deposited the check." — approved placing funds into a bank account by writing something like "for deposit" and signing the back of a check
There were a great many bundles of papers on it, some endorsed as Allegations, and some (to my surprise) as Libels, and some as being in the Consistory Court, and some in the Arches Court, and some in the Prerogative Court, and some in the Admiralty Court, and some in the Delegates' Court; giving me occasion to wonder much, how many Courts there might be in the gross, and how long it would take to understand them all.
Chapters 22-24 (69% in)
There are no more uses of "endorse" in David Copperfield.