check subscription response

app/controllers/discourse_donations/charges_controller.rb

@@ -35,7 +35,7 @@ module DiscourseDonations
         charge = payment.subscribe(email, params)
       end
 
-      if charge['paid'] == true
+      if (params['amount'].present? && charge['paid'] == true) || charge['status'] == 'active'
         output['messages'] << I18n.t('donations.payment.success')
 
         output['rewards'] << { type: :group, name: group_name } if group_name

app/services/discourse_donations/stripe.rb

@@ -24,14 +24,8 @@ module DiscourseDonations
     end
 
     def subscribe(email, opts)
-      customer = ::Stripe::Customer.create(
-        email: email,
-        source: opts[:stripeToken]
-      )
-      @subscription = ::Stripe::Subscription.create(
-        customer: customer.id,
-        plan: opts[:plan]
-      )
+      customer = ::Stripe::Customer.create(email: email, source: opts[:stripeToken])
+      @subscription = ::Stripe::Subscription.create(customer: customer.id, plan: opts[:plan])
       @subscription
     end