convert amount in param

app/controllers/patrons_controller.rb

@@ -15,7 +15,7 @@ module DiscoursePatrons
       begin
 
         response = ::Stripe::PaymentIntent.create(
-          amount: params[:amount],
+          amount: param_currency_to_number,
           currency: SiteSetting.discourse_patrons_currency,
           payment_method_types: ['card'],
           payment_method: params[:paymentMethodId],
@@ -30,5 +30,11 @@ module DiscoursePatrons
 
       render json: response
     end
+
+    private
+
+    def param_currency_to_number
+      params[:amount].to_s.sub('.', '').to_i
+    end
   end
 end

spec/controllers/discourse_patrons/patrons_controller_spec.rb

@@ -24,6 +24,18 @@ module DiscoursePatrons
         post :create, params: {}, format: :json
         expect(response).to have_http_status(200)
       end
+
+      it 'has the correct amount' do
+        ::Stripe::PaymentIntent.expects(:create).with(has_entry(:amount, 2000))
+        post :create, params: { amount: '20.00' }, format: :json
+        expect(response).to have_http_status(200)
+      end
+
+      it 'has no amount' do
+        ::Stripe::PaymentIntent.expects(:create).with(has_entry(:amount, 0))
+        post :create, params: {}, format: :json
+        expect(response).to have_http_status(200)
+      end
     end
   end
 end