An advertisement management system can enable an advertiser to switch between realtime bidding and reservation delivery modes. A request is received to transition a campaign from a real-time bidding mode to a reservation mode. A reservation engine determines proposed terms for a reservation contract. An acceptance of the proposed terms is received from the advertiser. The campaign is transitioned from the real-time bidding mode to the reservation mode and a reservation contract is established between the advertisement management system and the advertiser, with campaign parameters made immutable for the duration of the contract.

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