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

commit 356a501243baea1b31e3977a739d10929244d257
parent 03ae6e414c8ea3a8b0572c0144a687dca1691348
Author: Christian Grothoff <christian@grothoff.org>
Date:   Sun,  9 Aug 2026 16:49:20 +0200

update doxygen

	merchant Merchant backend to process payments, run by merchants
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