Finalmente, lo descubrí después de algunas investigaciones. A continuación se muestra el código de trabajo del servicio web de pago de woocommerce que puede ayudar a otros:

 /*** Just Copy & Paste and change your varriables **/ //do your initial stuff header('Content-type: application/json'); $json_file=file_get_contents('php://input'); $jsonvalue= json_decode($json_file,true); $user_id = $jsonvalue['user_id']; $product_id = $jsonvalue['product_id']; $quantity = $jsonvalue['quantity']; //start order data $orderData = array( "order" => array( 'payment_method' => 'paypal', 'payment_method_title' => 'Paypal', 'set_paid' => true, "billing_address" => array( "first_name" => "bfname", "last_name" => "blname", "company" => "testcompanybilling", "address_1" => "sec8", "address_2" => "e32", "city" => "noida", "state" => "Noida", "postcode" => "99999", "country" => "IN", "email" => "test@gmail.com", "phone" => "888899999999" ), "shipping_address" => array( "first_name" => "sfname", "last_name" => "slname", "company" => "testcompanyshipping", "address_1" => "shakkarpur", "address_2" => "laxminigar", "city" => "New Delhi", "state" => "Delhi", "postcode" => "110092", "country" => "IN", "email" => "testsh@gmail.com", "phone" => "11009999" ), "customer_id" => $user_id, "line_items" => array( array( "product_id" => $product_id, "quantity" => $quantity ) ) ) ); //Create order usind order data $data = $client->orders->create($orderData); //echo '<pre>'; //print_r($data); $result['success']='true'; $result['error']="0"; $result['msg']='Your order has been successfully placed.'; $result['data']=$data; echo json_encode($result); `

¡¡¡salud!!!

Puede consultar la documentación de la API REST de Woocommerce para el desarrollo de la API REST de Woocommerce.

Para las pasarelas de pago, consulte la siguiente URL:
http://woocommerce.github.io/woocommerce-rest-api-docs/#payment-gateways

Para el pago, consulte la siguiente URL: API de WooCommerce: cree un pedido y finalice el pago

Espero que esto ayude.