Fulfillment companies that ALSO handle personalized print jobs?

I'm working on a product that comes with a high-end personalized printed certificate for each recipient. I haven't been able to easily search for / identify U.S. companies that could handle this (i.e. In addition to packaging and sending the physical product, also ingesting custom variables and the performing the certificate print job on nice paper and bundling it with the shipment). Will I find such a company? Any help on how to search accordingly? I am an American but based abroad and need to ship everything from the States, hence this need. Thanks!

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