What are the chances of facebook shutting down my account if i run a promotion w/o a 3rd party app?

I have a small business overseas and i would like to randomly give a gift certificate to one of the people that like or share my post.I heard that facebook only allows this through a 3rd party app. If thats true does anyone know the chances of facebook catching me. Idon’t plan on having more than 1,500 followers

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