Video content including content item slots

A system to integrate digital content, comprising:

• one or more servers comprising one or more processors to:
• receive, from a client device, an audio request for a document for presentation via the client device, the document including audio content and an encoding that specifies a content item spot;
• select, based on the audio request, the document;
• transmit, responsive to the audio request and selection of the document, the document to the client device to cause the client device to initiate playback of the document using a content rendering application and execute, subsequent to initiation of playback of the document, the encoding that specifies the content item spot;
• receive, from the client device, a request for one or more content items to insert at a start time corresponding to the content item spot;
• select, responsive to the request, a content item;
• and
• provide, to the client device, the content item for insertion in the content item spot at the start time for presentation along with the document comprising audio.

A method of integrating digital content, comprising:

• receiving, by one or more servers having one or more processors, from a client device, an audio request for a document for presentation via the client device, the document including audio content and an encoding that specifies a content item spot;
• selecting, by the one or more servers based on the audio request, the document;
• transmitting, by the one or more servers responsive to the audio request and selection of the document, the document to the client device to cause the client device to initiate playback of the document using a content rendering application and execute, subsequent to initiation of playback of the document, the encoding that specifies the content item spot;
• receiving, by the one or more servers from the client device, a request for one or more content items to insert at a start time corresponding to the content item spot;
• selecting, by the one or more servers responsive to the request, a content item;
• and
• providing, by the one or more servers to the client device, the content item for insertion in the content item spot at the start time for presentation along with the document comprising audio.