Create a Facebook AUTO REPLY function for FACEBOOK Private messages -- 2

I am looking for a function in facebook (perhaps an external app, page, or whatever) that will AUTO REPLY any incoming facebook private message. Private messages are the person to person direct messages in facebook, visible in browser or in their mobile app or even their dedicated messenger app. There already is a service doing this but with limitations, it is [login to view URL] Limitations are: Only working for 1 week at a time. Only sending 1 auto reply per contact. So if contact A messages me today, he gets the auto reply, but if he messages me again tomorrow the auto reply is not sent again. I need some service/app/page/script that monitors someones facebook private messages and will auto reply with a predefined text. This text should be editable somewhere and the frequency also, so there should be options like 'auto reply 1x per person per day' or 'autoreply to any message continiuous'. My budget is 75 euro max. If you think can do it but it is a lot more work, send me a message and inform me why it is more work, I might consider it.