"Unpaid" in the operative complaint? What is being paid in an operative complaint?

Below is a quote from the judge dismissing the Trump campaign lawsuit in Pennsylvania. Emphasis mine.

https://www.msn.com/en-us/news/politics/a-federal-judge-threw-out-a-major-trump-campaign-lawsuit-in-pennsylvania-issuing-a-blistering-opinion-refusing-to-disenfranchise-7-million-voters/ar-BB1beNha?ocid=msedgdhp

"One might expect that when seeking such a startling outcome, a
plaintiff would come formidably armed with compelling legal arguments
and factual proof of rampant corruption," Brann wrote. "That has not
happened. Instead, this Court has been presented with strained legal
arguments without merit and speculative accusations, unpaid in the
operative complaint and unsupported by evidence."

It is a use of the verb "to pay" I have not seen. I think "unpaid" refers to the speculative accusations. I think "pay" means to give something of worth usually in exchange for something else. In a worthy case, what would one pay these accusations that here are unpaid? Or are the accusations themselves what the case should be paying, as one might "pay respects" or "pay homage"?

Or is this the other sense of pay as in "pay out a line" to describe gradually releasing a length of cord or rope? Would a good case pay out accusations?