Application programming interface for rendering personalized related content to third party applications

A system for providing related content items, the system comprising:

• a hardware processor of a server associated with a content provider system that:
• receives, from an application, a request for content related to a content item hosted by the content provider system, wherein the request includes a content identifier corresponding of the content item and a token that represents a pairing of an application identifier to the application providing the request and a user identifier;
• identifies, at the server associated with the content provider system, the application identifier and the user identifier represented by the token;
• and
• in response to determining that the application is authorized to provide the request, transmits, to the application, a list of related content items based on the content identifier and the token.

A non-transitory computer-readable medium containing computer-executable instructions that, when executed by a hardware processor, cause the hardware processor to perform a method for providing related content items, the method comprising:

• receiving, at a server associated with a content provider system from an application, a request for content related to a content item hosted by the content provider system, wherein the request includes a content identifier corresponding to the content item and a token that represents a pairing of an application identifier of the application providing the request and a user identifier;
• identifying, at the server associated with the content provider system, the application identifier and the user identifier represented by the token;
• and
• in response to determining that the application is authorized to provide the request, transmitting, to the application, a list of related content items based on the content identifier and the token.