1. A computer-implemented method, comprising: receiving user input specifying (i) search criteria for acquiring search results, (ii) a maximum payment amount for purchasing document content, and (iii) result parameters for indicating how to integrate document content embodying search results into a document; defining a machine readable form of the search criteria and the result parameters for insertion into the document; responsive to receipt of the search criteria inserted in the document in the machine readable form, using the search criteria to acquire search results; the acquired search results being associated with a purchase fee; providing, for integration into the document, document content embodying the acquired search results in accordance with the result parameters when the purchase fee of the acquired search results is less than or equal to the maximum payment amount for purchasing document content; wherein at least said receiving, defining, using, and providing are performed using one or more processors.