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For both interactive and background requests, a Payway account token is returned in the final result. This may be a new token referring to a newly-created account, or a pre-existing token. These account tokens can be stored and used for any request related to the account that is referred to by the token.
There is no need to add an account explicitly using addAccount to generate a token. If you send a sale or other type of request with account data, a token referring to the new account—possibly an existing account if all the account data matches an existing account is returned in the detailed results.