Recommendation on Subscription Payment App

[rahulchd891]

I am looking for a recommendation on a monthly subscription payment app. 

I am only selling one product on my website and that would be through subscription only.  I would like an App where I could have the following option shown to the customer: 

The steps: 

1. Select quantity 
1. Option 1 - Price A 
2. Option 2 - Price B 
2. Select Roast type 
1. Option 1 
2. Option 2
3. Select Grind Type 
1. Option 1
2. Option 2 
4. Delivery date:
1. Option 1 
2. Option 2
5. Add to Cart button

Also, I would like an app that integrates with another loyalty app so that customers can use their loyalty points/credits to deduct money from their subscription payment. (Any recommendation on a good loyalty app that's compatible with the subscription app would be greatly appreciated. 

Thanks in advance.