update docs - merchant - Merchant backend to process payments, run by merchants

commit 6bf97747e5ae4d791a9f7b7e5ea3f54ba67efbc3
parent cf9a14780cbbd99b50c054579ff002d5e54eaee1
Author: Christian Grothoff <christian@grothoff.org>
Date:   Sun, 24 Sep 2023 20:25:24 +0200

update docs

	merchant Merchant backend to process payments, run by merchants
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