freshdesk API ticket with custom field and attachment

freshdesk-api.php

<?php

    $api_key = esc_attr( get_option('freshdesk_tickets_api_key') );
		$password = "x";
		$yourdomain = "youdomain";

		$custom_fields = array("bio" => esc_attr($_REQUEST['bio']) );
		$ticket_payload = array(
			'name' => esc_attr($_REQUEST['name']),
			'email' => esc_attr($_REQUEST['email']),
			'phone' => esc_attr($_REQUEST['phone']),
			'subject' =>  esc_attr($_REQUEST['subject']),
			'description' => esc_attr($_REQUEST['description']),
			'custom_fields' => $custom_fields,
			'priority' => 2,
			'status' => 2,
			'type' => 'Question'
			
			
		);
		
		

		# Attachment details:		//product_img contains the local image url
		$file1 = new FileDetail($_REQUEST['product_img'], "image/png", end(explode('/',$_REQUEST['product_img'])));
		
		## Code starts:
		$data = "";
		$eol = "\r\n";
		
		$mime_boundary = md5(time());

		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="name"' . $eol . $eol;
		$data .= $ticket_payload['name'] . $eol;

		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="email"' . $eol . $eol;
		$data .= $ticket_payload['email'] . $eol;

		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="phone"' . $eol . $eol;
		$data .= $ticket_payload['phone'] . $eol;
				
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="subject"' . $eol . $eol;
		$data .=  $ticket_payload['subject']. $eol;
		
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="priority"' . $eol . $eol;
		$data .= "2" . $eol;
		
		// status should be a number
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="status"' . $eol . $eol;
		$data .= "2" . $eol;
		
		
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="description"' . $eol . $eol;
		$data .= $ticket_payload["description"] . $eol;

		if(is_array($ticket_payload['custom_fields']) && count($ticket_payload['custom_fields']) >0 && array_key_exists('bio', $ticket_payload['custom_fields'])){
			$data .= '--' . $mime_boundary . $eol;
			$data .= 'Content-Disposition: form-data; name="custom_fields[cf_brief_introduction]"' . $eol . $eol;
			$data .= $_REQUEST["bio"] . $eol;

			$data .= '--' . $mime_boundary . $eol;
			$data .= 'Content-Disposition: form-data; name="type"' . $eol . $eol;
			$data .= $ticket_payload["type"] . $eol;

			$data .= '--' . $mime_boundary . $eol;
			$data .= 'Content-Disposition: form-data; name="tags[]"' . $eol . $eol;
			$data .= "Coaching" . $eol;
		}
		
		$data .= '--' . $mime_boundary . $eol;
		$data .= 'Content-Disposition: form-data; name="attachments[]"; filename="' . $file1->name . '"' . $eol;
		$data .= "Content-Type: $file1->contentType" . $eol . $eol;
		$data .= file_get_contents($file1->path) . $eol;
		
		
		$data .= "--" . $mime_boundary . "--" . $eol . $eol;
		
		$header[] = "Content-type: multipart/form-data; boundary=" . $mime_boundary;


		$url = "https://$yourdomain.freshdesk.com/api/v2/tickets";

		$ch = curl_init($url);


		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
		curl_setopt($ch, CURLOPT_USERPWD, "$api_key:$password");
		curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
		curl_setopt($ch, CURLOPT_HEADER, true);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

		$server_output = curl_exec($ch);
		$info = curl_getinfo($ch);
		$header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
		$headers = substr($server_output, 0, $header_size);
		$response = substr($server_output, $header_size);

		$message = "";
		$code = 0;

		if($info['http_code'] == 201) {
			if(isset($_REQUEST['bio']) && !empty($_REQUEST['bio'])){
				$message =  esc_attr( get_option('coaching_form_submit_message') );
			}
			else{
				$message =  esc_attr( get_option('form_submit_message') );

			}
			$code = 1;
		} else {
			if($info['http_code'] == 404) {
				
        $message =  "Error, HTTP Status Code : " . $info['http_code'] . "\n";
        $message .= "Headers are ".$headers;
        $message .=  "Response are ".$response;
      }
		}

		curl_close($ch);

		die(json_encode(array('message' => $message, "data"=>"fd_create_ticket", 'code' => $code)));

Improving on
https://github.com/freshworks/fresh-samples/blob/master/PHP/create_ticket_with_multiple_attachments.php