7. A system comprising: a processor; and a computer-readable storage device storing instructions which, when executed by the processor, cause the processor to perform operations comprising: (1) establishing, from a merchant site, communication between the merchant site and a generalized search entity via a communication interface, wherein the generalized search entity: A. presents an input field on user interface of the generalized search entity, wherein the generalized search entity processes data using a generalized search engine that indexes and searches both merchant sites and non-merchant sites; B. receives, from a user, user input in the input field, wherein the user input is textual; C. correlates the user input against a product database of products for sale from a merchant to yield a correlation; D. determines that the use input is associated with one of a search intent and a purchase intent to yield a determination, wherein the determination of whether the user input indicates the purchase intent or search intent is based on the correlation; E. when the determination indicates the search intent: presents a search result comprising a non-merchant site; receives a search interaction associated with the non-merchant site; and transitions the user to the non-merchant site; F. when the determination indicates the purchase intent: presents a purchase-related search result comprising a buy option associated with the user input, the search result comprising an item offered from the merchant site; and receives a purchase interaction associated with the buy option; (2) when the determination indicates the purchase intent: receiving, via the communication interface and at the merchant site, payment information from the generalized search entity, the payment information associated with the purchase interaction for the item; and processing delivery of the item.
7. A system comprising: a processor; and a computer-readable storage device storing instructions which, when executed by the processor, cause the processor to perform operations comprising: (1) establishing, from a merchant site, communication between the merchant site and a generalized search entity via a communication interface, wherein the generalized search entity: A. presents an input field on user interface of the generalized search entity, wherein the generalized search entity processes data using a generalized search engine that indexes and searches both merchant sites and non-merchant sites; B. receives, from a user, user input in the input field, wherein the user input is textual; C. correlates the user input against a product database of products for sale from a merchant to yield a correlation; D. determines that the use input is associated with one of a search intent and a purchase intent to yield a determination, wherein the determination of whether the user input indicates the purchase intent or search intent is based on the correlation; E. when the determination indicates the search intent: presents a search result comprising a non-merchant site; receives a search interaction associated with the non-merchant site; and transitions the user to the non-merchant site; F. when the determination indicates the purchase intent: presents a purchase-related search result comprising a buy option associated with the user input, the search result comprising an item offered from the merchant site; and receives a purchase interaction associated with the buy option; (2) when the determination indicates the purchase intent: receiving, via the communication interface and at the merchant site, payment information from the generalized search entity, the payment information associated with the purchase interaction for the item; and processing delivery of the item. 8. The system of claim 7 , wherein the merchant sites and non-merchant sites are websites.