PHP cURL调用Avalara JSON接口报错，Postman可正常运行

我给Avalara创建了包含10个行项目的JSON请求，但通过PHP cURL调用时一直报错：

code: ErrorCountLimitExceededError
number: 1722
message: 请求超出最大验证错误数量限制。

把行项目减到6个时请求能正常执行，但业务需要更多行项目。而且相同的JSON在Postman里完全能正常运行，JSON代码如下：

{    
    "lines": [        
        {            
            "number": "1",            
            "quantity": 1,            
            "amount": 100,            
            "taxCode": "PS081282",            
            "itemCode": "Y0001GHGH",            
            "description": "TEST"        
        },        
        {            
            "number": "2",            
            "quantity": 1,            
            "amount": 100,            
            "taxCode": "PS081282A",            
            "itemCode": "TTTTYYYA",            
            "description": "TEST"        
        },        
        {            
            "number": "3",            
            "quantity": 1,            
            "amount": 190,            
            "taxCode": "PS081282B",            
            "itemCode": "HGHGHG0001B",            
            "description": "TEST"        
        },        
        {            
            "number": "4",            
            "quantity": 1,            
            "amount": 2300,            
            "taxCode": "PS081282C",            
            "itemCode": "PKOO0001C",            
            "description": "TEST"        
        },        
        {            
            "number": "5",            
            "quantity": 1,            
            "amount": 200,            
            "taxCode": "PS081282D",            
            "itemCode": "ABCF567",            
            "description": "TEST"        
        },        
        {            
            "number": "6",            
            "quantity": 1,            
            "amount": 10990,            
            "taxCode": "PS081282E",            
            "itemCode": "Y00DSD01E",            
            "description": "TEST"        
        },        
        {            
            "number": "7",            
            "quantity": 1,            
            "amount": 140,            
            "taxCode": "PS081282F",            
            "itemCode": "Y00GJG232",            
            "description": "TEST"        
        },        
        {            
            "number": "8",            
            "quantity": 1,            
            "amount": 100,            
            "taxCode": "PS081282F2X",            
            "itemCode": "65HGFH675",            
            "description": "TEST"        
        }    
    ],    
    "type": "SalesInvoice",    
    "companyCode": "DEFAULT",    
    "date": "2023-01-10",    
    "customerCode": "ABC",    
    "purchaseOrderNo": "2023-01-10-001",    
    "addresses": {        
        "singleLocation": {            
            "line1": "2000 Main Street",            
            "city": "Irvine",            
            "region": "CA",            
            "country": "US",            
            "postalCode": "92614"        
        }    
    },    
    "commit": true,    
    "currencyCode": "USD",    
    "description": "Yarn"
}

排查与解决步骤 #

1. 修正PHP cURL的请求配置 #

Postman会自动处理请求头和编码细节，PHP cURL常因配置缺失触发错误：

• 确保设置正确的请求头：

  curl_setopt($ch, CURLOPT_HTTPHEADER, [
      'Content-Type: application/json',
      'Authorization: Bearer YOUR_API_TOKEN' // 替换为你的实际API令牌
  ]);
  

• 生成JSON时避免不必要的转义：

  $jsonData = json_encode($requestData, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);
  

• 调整PHP的请求大小限制，避免JSON体积触顶：

  ini_set('post_max_size', '10M');
  ini_set('upload_max_filesize', '10M');
  

2. 对比Postman与PHP cURL的请求细节 #

开启cURL调试日志，把实际发送的请求和Postman的对比，定位差异：

$ch = curl_init('YOUR_AVALARA_API_ENDPOINT');
// 开启调试日志
curl_setopt($ch, CURLOPT_VERBOSE, true);
$verboseLog = fopen('php://temp', 'w+');
curl_setopt($ch, CURLOPT_STDERR, $verboseLog);

// 其他cURL配置
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

// 读取并输出日志
rewind($verboseLog);
$logContent = stream_get_contents($verboseLog);
echo "请求日志:\n" . $logContent;
fclose($verboseLog);
curl_close($ch);

重点核对：

• 请求头是否完全一致（包括Content-Length）
• 请求体的JSON是否和Postman发送的完全相同（无多余空格、转义符）

3. 验证API环境与端点一致性 #

确认PHP请求的API端点（沙箱/生产）和Postman完全一致，不同环境的验证规则或限制可能存在差异。

4. 排除JSON生成的隐藏格式问题 #

直接把Postman导出的请求体复制为PHP字符串发送，测试是否能成功。如果成功，说明是PHP生成JSON时引入了不可见字符或格式错误，需要调整json_encode的参数或数据预处理逻辑。

内容的提问来源于stack exchange，提问作者Mathew