A statement in writing must be made, signed by the defendant, and verified by his oath, to the following effect:
1.It must authorize the entry of judgment for a specified sum;
2.If it be for money due, or to become due, it must state concisely the facts out of which it arose, and show that the sum confessed therefor is justly due, or to become due;
3.If it be for the purpose of securing the plaintiff against a contingent liability, it must state concisely the facts constituting the liability, and show that the sum confessed therefor does not exceed the same.