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Microsoft Dynamics CRM API Development for Online and On-Premise Environments by Triston Arisawa, Mark Beckner

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  JScript and the REST Endpoint API        Chapter 4 

The REST endpoint API is a service that allows for the querying, updating, and creating of data – all within JScript callable from your CRM forms. In ­previous versions of CRM, FetchXML could be used to query data, but there were huge ­limitations on what could be done around updating and creating records. A lot of code had to be written, and the complexities associated with it often resulted in the requirement that a plugin be written. Now, FetchXML is only used for SSRS reporting, while the updating and creating of records is a simple task. This chapter outlines how to work with JScript and web resources, and how to write queries, updates, and creates using the REST endpoint service.

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