Dic: as it (so) happens, It just so happens that..

• She called Amy to see if she had any idea of her son's whereabouts. As it happened, Amy had. 
• It just so happens that my daughter lives in Mexico, and I do know a bit about the situation there.
• As it happens, I know someone who might be able to help you.

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△ You use as it happens in order to introduce a statement, especially one that is rather surprising.

△ it just so happens (that): surprisingly.
    Usage notes: said about an unexpected or unlikely fact

△ as it happens/it just so happens: used to tell someone something that is surprising, interesting, or useful

.... Cobuild, Cambridge Dictionary of American Idioms, LDOCE