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

commit 9acbde61c50db13b7a6b209f11c8dbfa59bed2d3
parent fe93c459a665d46013c177d89f9df9df630836ab
Author: Christian Grothoff <christian@grothoff.org>
Date:   Fri,  9 May 2025 14:59:06 +0200

update docs

	merchant Merchant backend to process payments, run by merchants
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