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Here is my sample code, but I got a response that says "One or more parameters were missing or invalid" Is there something wrong in my implementation on pinpayments API?

 $post = array();
 $post['email'] = 'chi@gmail.com';
 $post['amount'] = 10.00;
 $post['description'] = 'website payment';
 $post['ip_address'] = $_SERVER['REMOTE_ADDR'];
 $post['customer_token]'] = 'cus_n8k1YbNqgf1Kk4IlKWNN_g';

 // Create a curl handle
 $ch = curl_init($url);

 curl_setopt($ch, CURLOPT_USERPWD, $private_api_key); //authenticate
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); //make sure it returns a response
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // allow https verification if true
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false); // allow https verification if true
 curl_setopt($ch, CURLOPT_POST, 1); //tell it we are posting
 curl_setopt($ch, CURLOPT_POSTFIELDS, $post); //tell it what to post
 curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json')); //response comes back as json

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

 // Check if any error occurred
 if(!curl_errno($ch))$info = curl_getinfo($ch);

 // Close handle
 curl_close($ch);

 //Decode JSON
 $response = json_decode($response, true);

 //Success? 
 if(!empty($response['response']['success']) && $response['response']['success'] == 1)
 
 echo 'Successufully sent';
 
 else
 
 echo 'Error: ' . $response['error_description'];