Thursday Morning Riddle

I’m keyed into machines where transactions are made;
Struck by balls in the lanes; also, in the arcade;
To post pictures online where they’re often displayed;
I keep wrestlers down; and restrain the grenade.

Who am I?

UPDATE: Riddle solved by Asher. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. Asher Says:

    Pin

  2. Bill Says:

    PIN is correct. Way to go, Asher!

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