Since we don't perform identity verification on accounts in the Sandbox environment, we allow you to pass in a sentinel value for simulating the verification status you wish the Verified Customer to be placed in after Customer creation.
To simulate the various statuses in the Sandbox, submit either
suspended in the firstName parameter in order to create a new Verified Customer with that status.
Customer verification statuses workflows:
created -> verified — (Happy path)
created -> retry -> document -> verified
created -> retry -> suspended
created -> retry -> verified
created -> document -> verified
For more information on handling verification statuses for this Customer type, reference our Customer verification resource article.