Use the following steps to add a product to a subscription. These steps must be followed for each product you want to add.
See the API documentation about Adding a Product and follow the instructions based on your WSDL version.
Set the contract effective, effective, service activation, and customer acceptance dates to the date you want the new product to take effect.
Most companies make product additions effective immediately during an invoice period.
If you want to make product additions effective for the next invoice period or next term, set the contract effective date to the first day of the next invoice period or the first day of the next term.
You can add products when certain types of future-dated amendments exist on the subscription.
See Future-dated Amendments for more information about supported types of future-dated amendments.