如何用Curl调用PayPal订阅API查询已有计费计划信息

Hey there, let's work through why your cURL command isn't returning a response and fix it up!

The Main Issues in Your Current Command #

1. Wrong HTTP Method: Looking up a billing plan uses a GET request, not POST. PayPal's v1/billing/plans/{plan_id} endpoint only accepts GET for retrieving plan details (POST is reserved for creating or updating plans).
2. Duplicate Header: You've included Content-Type: application/json twice—this is unnecessary, and for GET requests, you don't even need this header at all.
3. Formatting Glitches: The backslashes in your command have extra spaces after them, which can cause parsing issues when exec() runs the command.

Correct cURL Command (Standalone) #

First, here's the fixed standalone cURL command you can test directly in your terminal:

curl -v -X GET https://api.sandbox.paypal.com/v1/billing/plans/____PLANID_____ \
  -H "Accept-Language: en_US" \
  -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

Just replace ____PLANID_____ with your actual plan ID and YOUR_ACCESS_TOKEN with the token from paypal_tokenix().

Fixed PHP Code Using exec() #

If you want to keep using exec() in PHP, here's the cleaned-up version with safety and formatting fixes:

// Grab your PayPal access token
$paypal_token = paypal_tokenix();
// Replace with your actual plan ID
$plan_id = '____PLANID_____';

// Build the cURL command with proper escaping
$paypalcurl = 'curl -v -X GET "https://api.sandbox.paypal.com/v1/billing/plans/' . $plan_id . '" \
  -H "Accept-Language: en_US" \
  -H "Authorization: Bearer ' . escapeshellarg($paypal_token) . '"';

// Execute the command and capture output/errors
$output_lines = [];
$return_status = 0;
exec($paypalcurl . ' 2>&1', $output_lines, $return_status);

// Combine output lines and parse JSON
$raw_response = implode("\n", $output_lines);
$plan_result = json_decode($raw_response, true);

// Debug the result
var_dump($plan_result);

• escapeshellarg() ensures your access token is safely escaped to avoid command injection risks.
• Combining output lines into a single string fixes issues with split response data that can break JSON parsing.

Better Alternative: Use PHP's Built-in cURL Extension #

Using PHP's native cURL functions is more reliable than calling system cURL via exec()—it's easier to debug and avoids environment-specific issues. Here's how to do it:

$plan_id = '____PLANID_____';
$paypal_token = paypal_tokenix();

// Initialize cURL session
$ch = curl_init();

// Set cURL options
curl_setopt($ch, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/billing/plans/{$plan_id}");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // Return response as string
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Accept-Language: en_US',
    "Authorization: Bearer {$paypal_token}"
]);
curl_setopt($ch, CURLOPT_VERBOSE, true); // Enable verbose logging for debugging (optional)

// Execute the request
$response = curl_exec($ch);

// Check for cURL errors
if (curl_errno($ch)) {
    echo "cURL Error: " . curl_error($ch);
}

// Close the session
curl_close($ch);

// Parse and debug the result
$plan_result = json_decode($response, true);
var_dump($plan_result);

内容的提问来源于stack exchange，提问作者Jintor