'Correct way of invoking an api gateway with json payload and binary data

I need to develop an API Gateway that received a binary file and some additional information (you can consider them as metadata: original filename plus description)

What's the correct way in AWS? Encode the binary as Base64 or is there a more efficient way? The first way I know how to do, but I don't know if in AWS world it's the correct way

Thanks

aws-api-gateway

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'Correct way of invoking an api gateway with json payload and binary data

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