A contract engaging a service provider to provide services 'in accordance with the [client's] requirements' creates an obligation on the client to use the provider for its objectively ascertainable requirements, not merely a standing offer that the client may call upon at will. The text and structure of the contract as a whole — including obligations to inform, provide information, make regular payments, and termination provisions — are critical indicators of whether the engagement is a standing offer or a continuing obligation. Background or extrinsic material may be examined in construing a contract without the need first to identify a textual ambiguity.
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