This document describes the setup the Payer needs to do.
The Redeemers have performed the steps in Creating Bitcoin wallets.
The Matcher has performed the step in Setting Up.
The steps the Payer needs to perform are:
Copy the file matcher/export-to-payer/matcher-key.asc
to payer/import-from-matcher/matcher-key.asc
Note: this public key will typically be provided in the client application so in real life this step would be done automatically.