php – 条纹账户资金不足

$958,395.72
Available balance

$2,659.48
Pending balance

$3,010,474.35
Total volume (HKD)

这笔余额以港元计算.
现在我必须以美元汇款.
如果我尝试转移4.25美元,那么它会给我以下错误：

Type: StripeErrorInvalidRequest

Message: Insufficient funds in Stripe account. In test mode,you can
add funds to your available balance (bypassing your pending balance)
by creating a charge with 4000 0000 0000 0077 as the card number. You
can use the the /v1/balance endpoint to view your Stripe balance (for
more details,see stripe.com/docs/api#balance).

转移代码：

$check_balnace = StripeBalance::retrieve();
$balanceArr = $check_balnace->__toArray(true);
$available_amount = $balanceArr['available']['0']['amount'];
echo $available_amount; // $958,395.72
$amount = 4.25*100;
$amount = 425;
StripeTransfer::create(array("amount" => $amount,"currency" => "usd","destination" => 'stripr_uid',"description" => 'test'));

即使我有足够的平衡,为什么会发生这种错误？