Systems and methods for generating hierarchical request messages for media placement opportunities

A computer system comprising:

• one or more processors;
• and
• memory storing one or more programs, the one or more programs including instructions for:
• determining one or more media placement opportunities for a media application at a client device;
• generating a request message that includes an indication of each media placement opportunity of the one or more media placement opportunities, wherein:
• the request message has a framework with at least one level;
• the at least one level identifies, for each media placement opportunity, a content type of a plurality of possible content types for a respective context, and
• the plurality of possible content types for an in-stream context in the framework is different from the plurality of possible content types for an on-surface context in the framework;
• transmitting the request message to a server system;
• receiving, from the server system, a response to the request message that includes one or more media content items selected based on information included in the framework of the request message;
• and
• providing, to the media application at the client device, at least one of the one or more media content items within at least one of the media placement opportunities.

A non-transitory computer-readable storage medium storing one or more programs for execution by a computer system with one or more processors, the one or more programs comprising instructions for:

• generating a request message that includes an indication of each media placement opportunity of the one or more media placement opportunities, wherein:
• the request message has a framework with at least one level;
• the at least one level identifies, for each media placement opportunity, a content type of a plurality of possible content types for a respective context, and
• the plurality of possible content types for an in-stream context in the framework is different from the plurality of possible content types for an on-surface context in the framework;
• transmitting the request message to a server system;
• receiving, from the server system, a response to the request message that includes one or more media content items selected based on information included in the framework of the request message;
• and
• providing, to a media application at a client device, at least one of the one or more media content items within at least one of the media placement opportunities.