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$raw = '
{
    "id": "c4d4f8ec-8b57-5880-b86e-c007bb148124",
    "create_time": "2026-02-24T23:51:27+08:00",
    "resource_type": "encrypt-resource",
    "event_type": "TRANSACTION.SUCCESS",
    "summary": "支付成功",
    "resource":
    {
        "original_type": "transaction",
        "algorithm": "AEAD_AES_256_GCM",
        "ciphertext": "微信支付密文",
        "associated_data": "transaction",
        "nonce": "UD01wII7yRkt"
    }
}';

$data = json_decode($raw, true);

$ciphertext = $data['resource']['ciphertext'];
$key = config('wechat_pay.secret_key'); // V3密钥
$nonce = $data['resource']['nonce'];
$associatedData = $data['resource']['associated_data'] ?? '';

// 直接使用AesGcm解密
$plaintext = \EasyWeChat\Kernel\Support\AesGcm::decrypt($ciphertext, $key, $nonce, $associatedData);
$decryptedData = json_decode($plaintext, true);
dd($decryptedData);

// 使用解密后的数据
$outTradeNo = $decryptedData['out_trade_no'];
$transactionId = $decryptedData['transaction_id'];
// ... 其他业务逻辑