Thanks for your inquiry to Visa Developer. Because we are an open platform, there is no cost to you to develop or prototype your application with any API in the sandbox.
When ready to transition to production use of the APIs, fees are assessed for each API used by the application. Fees are evaluated by application and are a function of many elements, including: the nature of the application, the application's use of data returned by the API, and your relationship with any existing Visa partner(s) such as financial institutions.
Visa treats production applications on a case by case basis, and works with you to determine appropriate pricing.
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Thanks for your inquiry and your interest in Visa Developer. Talking among the team here we wanted to give you more detail.
One assumes you mean throughput rates for individual APIs? In the production gateway, there is no preset rate for the VDP gateway nor for individual APIs in most cases, but each API will have different throughput characteristics, as you might expect.
Some APIs have preset rates built into their license structure, where the application's throughput is built into the API license fee. You'll know that long before you go to production if it applies to an API in your application.
When requesting your application to be moved to production, the throughput characteristics for your application are part of the Q&A. That information is used in part to ensure the VDP infrastructure and APIs have sufficient resources to accommodate the load across all clients.
Last, please note that the above applies to production traffic; the VDP Sandbox is not designed to model throughput. If someone starts driving high traffic volumes to the sandbox they will be asked to reduce it, or if needed their transaction rate may be throttled administratively.
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