added state machine for invoice

app/models/invoice_state_machine.rb

@@ -0,0 +1,44 @@
+# enum status: %i[unpaid paid cancelled failed]
+
+class InvoiceStateMachine
+  attr_reader :invoice, :status
+
+  def initialize(invoice:, status:)
+    @invoice = invoice
+    @status = status.to_sym
+  end
+
+  def call
+    case status
+    when :paid
+      mark_as_paid
+    when :cancelled
+      mark_as_cancel
+    when :unpaid
+      mark_as_unpaid
+    else
+      raise "Inavalid state #{invoice.status}"
+    end
+  end
+
+  private
+
+  def mark_as_paid
+    raise "Inavalid state #{invoice.status}" unless invoice.unpaid? || invoice.paid?
+
+    invoice.autobind_manually
+  end
+
+  def mark_as_cancel
+    # Paid invoice cannot be cancelled?
+    raise "Inavalid state #{invoice.status}" unless invoice.cancellable? || invoice.cancelled?
+
+    invoice.cancel
+  end
+
+  def mark_as_unpaid
+    raise "Inavalid state #{invoice.status}" unless invoice.paid? && invoice.payment_orders.present? || invoice.unpaid?
+
+    invoice.cancel_manualy
+  end
+end

app/models/payment_orders/every_pay.rb

@@ -30,6 +30,10 @@ module PaymentOrders
       valid_hmac? && valid_amount? && valid_account?
     end
 
+    def payment_reference?
+      response['payment_reference'].present?
+    end
+
     def settled_payment?
       SUCCESSFUL_PAYMENT.include?(response['payment_state'])
     end