Each integrating product must have its own unique product ID. You will use the product ID in several places throughout the code for your integration. We recommend that you create a constant for the product ID, rather than hard-coding the product ID into scripts. For example, the sample integrating application uses the following constant for the product ID:
Using a constant allows you to easily change the product ID if needed. It also allows you to begin coding if you haven’t yet requested a product ID from Microsoft.