This will involve copying down, verifying and then transferring the data file generated on civi1001:/srv/matching_gifts/employers.csv (path is set here should also be in email notification) over to frpm1001:/localsettings/payments-wiki/employers.csv. That file then needs git committing and deploying as part of a payments-wiki deploy.
To test that everything worked as expected, try out the employer field on this variant https://payments.wikimedia.org/index.php?title=Special:IngenicoGateway&appeal=JimmyQuote&ffname=cc-vmad&payment_method=cc&recurring=0&uselang=en&language=en¤cy=USD&amount=1&country=US&utm_campaign=internal_test&variant=employer