I'm happy to answer the question. There's no cost to you to develop your application using any of the APIs in the sandbox. When you're ready to move to Production, there are fees for each of the APIs that are used. Fees are evaluated by application and treat production applications on a case-by-case basis. We can work with you to determine pricing.
My apologies for the delayed response. Please share the project name with us and we'll have a Visa representative reach out to you soon about your Production request. Please let us know if you have other questions and someone will be happy to help.
We're happy to help. Please reach out to the CyberSource team directly.