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Right now server is only able to echo text messages but result in server error case of other attachments.

Adding a fail safe is needed for case where text is null

Server should also echo the image but response structure will need to change for that.

refer to facebook messenger api https://developers.facebook.com/docs/messenger-platform/reference/send-api/

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3 instance are being created for this task. Only one will be merged but if work is good enough, task will be accepted even if not merged.