Prepares the request for signing with the e-signature provider and returns the live signing URLs, the same payload GET .../signing-urls returns. Call this before the first signature: a request opened by a requirement has no provider document yet, so GET .../signing-urls returns an empty list until this runs.
The payee signs first, so this is the payee's call. A payer calling it prepares nothing and receives an empty signers array — the payer countersigns once the payee has signed, and the request reaches that state on its own.
Safe to call again. A request already prepared is not prepared a second time, and the URLs are returned either way — which matters because they are single-use and expire within the hour, so losing one is a normal reason to call this again.
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