For partnership accounts on our original product pricing, you can use the Partnership API for managing subscriptions. This doc explains some details for using the Browser, Synthetics, and Insights products.
The Partnership API is not available to your organization unless you're specifically instructed by your New Relic representative that you should use it.
New Relic uses this "bucket" pricing structure based on the quantity value in order to offer discounts on large volume purchases. Be sure to select an available bucket value. Otherwise, the New Relic Partnership API will return an error response.
Quantity by product
Here are the valid quantity values by New Relic product.