stipulate

Specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement.

“The will stipulates that she can live in the house for the rest of her life”

“The contract stipulates the dates of the payments”

Give a guarantee or promise of.

“They stipulated to release all the prisoners”

Make an oral contract or agreement in the verbal form of question and answer that is necessary to give it legal force.