This serves as a simple example how to use AWS Rekognition service for bots on Messenger which run on AS Lamba instance. It is written in python3.6 as a prototype only.
On developer's side it requires to add facebook page token as environmental variable FB_TOKEN and create an S3 bucket in which the incoming image is stored and then submited to Rekognition. It should be possible to send base64 encoded image straight from facebook's url to Rekognition, but did not work for me at the moment, so S3 is used as a workaround. For deployment, I recommende zappa for beginners.
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AWS account - familiarity with Lambda and S3 instances
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Lambda IAM role enabling it to use Rekognition and S3 resources
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Subscribe bot to a facebook page, use messaging token as
FB_TOKENenv variable -
on line68 define the verification token for webhook, or use the default value to verify the webhook
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Zappa deployment returns the webhook's url