feat:

- close order
- query order from kbz api

app/services/kbz_merchant.rb

@@ -5,23 +5,29 @@ class KbzMerchant
 
   def initialize(payment_method)
     @payment_method = payment_method
-    @api_url ='http://api.kbzpay.com/payment/gateway/uat/precreate'
   end
 
-  def create_order(amount:, merch_order_id:)
+  def create_order(amount:, merch_order_id:, timeout: '120m')
-    payload = build_payload(amount, merch_order_id)
+    api_url = 'http://api.kbzpay.com/payment/gateway/uat/precreate'
-    response = send_request(payload)
+    payload = build_create_payload(amount, merch_order_id, timeout)
+    response = send_request(payload, api_url)
     handle_response(response)
   end
 
+  def close_order(merch_order_id:)
+    api_url ='https://api.kbzpay.com/payment/gateway/uat/closeorder'
+    payload = build_close_payload(merch_order_id)
+    send_request(payload, api_url)
+  end
+
   private
 
-  def build_payload(amount, merch_order_id, timeout='120m')
+  def build_create_payload(amount, merch_order_id, timeout)
     base_params = {
       method: 'kbz.payment.precreate',
       timestamp: Time.now.utc.to_i.to_s,
       nonce_str: SecureRandom.hex(16),
-      notify_url: "http://localhost:3000/notify",
+      notify_url: 'https://example.com/notify',
       sign_type: 'SHA256',
       version: '1.0',
       biz_content: {
@@ -31,7 +37,25 @@ class KbzMerchant
         trade_type: 'PAY_BY_QRCODE',
         total_amount: amount.to_s,
         trans_currency: 'MMK',
-        timeout_express: timeout || '120m'
+        timeout_express: timeout
+      }.compact
+    }
+
+    flattened = flatten_hash(base_params)
+    base_params.merge(sign: generate_signature(flattened))
+  end
+
+  def build_close_payload(merch_order_id)
+    base_params = {
+      method: 'kbz.payment.closeorder',
+      timestamp: Time.now.utc.to_i.to_s,
+      nonce_str: SecureRandom.hex(16),
+      sign_type: 'SHA256',
+      version: '3.0',
+      biz_content: {
+        appid: @payment_method.gateway_url,
+        merch_code: @payment_method.merchant_account_id,
+        merch_order_id: merch_order_id
       }.compact
     }
 
@@ -59,7 +83,7 @@ class KbzMerchant
     Digest::SHA256.hexdigest(string_to_sign).upcase
   end
 
-  def send_request(payload)
+  def send_request(payload, url)
     headers = {
       'Content-Type' => 'application/json',
       'User-Agent' => 'KBZPay/1.0'
@@ -70,7 +94,7 @@ class KbzMerchant
 
     begin
      response = HTTParty.post(
-        @api_url,
+        url,
         headers: headers,
         body: { Request: payload }.to_json,
         timeout: 15