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当我使用 Drop-in UI 创建的“payment_method_nonce”调用 Braintree::Transaction.sale 时，一切正常。但是，当我在 Drop-in UI 中添加一些自定义字段并调用相同的 API 后，我收到错误消息“美国运通卡的 CVV 必须为 4 位，其他卡类型的 CVV 必须为 3 位”。我很确定 CVV 应该是正确的......有人知道这个错误吗？

iOS客户端实现：

    internal func tokenizeCreditCard(creditCard: CreditCard, completion: @escaping NerfireAPICompletionBlock) {

    // For client authorization,
    // get your tokenization key from the control panel
    // or fetch a client token

    let braintreeClient = BTAPIClient(authorization: <sandbox_token>)!
    let cardClient = BTCardClient(apiClient: braintreeClient)

    let card = BTCard(number: creditCard.number!, expirationMonth: creditCard.month!, expirationYear: creditCard.year!, cvv: creditCard.verificationValue!)
    cardClient.tokenizeCard(card) { (tokenizedCard, error) in
        if error != nil {
            completion(nil, error as NSError?)
        }else {
            completion(tokenizedCard, nil)
        }
    }
}

Ruby服务器端：

result = Braintree::Transaction.sale(
    :amount => "15.00",
    :payment_method_nonce => nonce_from_the_client,
    :options => {
        :submit_for_settlement => true
    }
)
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