OK, here is a challenge for you. 

Business Requirements

• Take payments from Mainland China customers for digital downloads. 
  • No payment gateway is available. 
  • Paypal may be possible. 
• Ask a series of questions to purchaser before taking payment. 
  • (optional) profile questions
  • Questions on who will be the person that support will be provided to (vs who is the person making the payment and requiring the receipt) 
    • This happens a lot. The person purchasing the product is not the person who will be using the product. 
• Potentially giving multiple payment options - such as:
  • Alipay. 
  • Invoice them so they can make a wire transfer. 
    • Details will be saved back into Salesforce, invoice auto created and sent to purchaser. 
  • Paypal. 
• Send a receipt to the purchaser. 
• Save all the data back into Salesforce once the payment has been made and profile form filled in.
• Click the Buy Now button from WordPress (now. Or Salesforce Communities public site eventually). 
• The Buy Now button will be on a Chinese Language page. 
• The forms must be in full Chinese Language. 
• The data saved back to Salesforce will be in English for some fields
  • Eg a Dropdown list of Chinese Language options for a particular field, needs to be saved back to Salesforce as their English equivalent. 
    • Form Assembly can do this very well see Multilingual Form Assembly Forms with Prefill. 
• The forms to be re-useable for multiple different products - based on a unique product code that has a different price for each product. 
  • Eg pass into the form the Product Code and Price via a shortcode or secure URL token for example. 

Options

• Stripe has an option to use Alipay. Sounds great. However Alipay is new and it ONLY works via the Stripe Checkout form, not via the Stripe API. 
  • Therefore we can't use existing forms tools like Gravity Forms or Form Assembly to embed their Stripe payments options into them. 
• Gravity Forms and Form Assembly both have great options for saving data back to Salesforce 
  • Form Assembly is much more powerful. 
  • Gravity forms integrates with WordPress nicer. 
  • Both won't work here due to Stripe Alipay only being available through the checkout form. 
• WP Simple Payments Pro works with Alipay really well 
  • Plus it does translation
  • And it allows for Alipay or Credit card, and the purchaser can choose. 
  • But it doesn't do Custom Fields well 
    • They are all just presented in a line of same sized fields - see their demo page.
  • And you can't prefill their checkout form. 
  • You can only then use Stripe to Salesforce via Zapier, which is not great. 

Crappy Solution

I have a crappy solution functioning at the moment

• WordPress page with Payment form.
• They enter minimum details - such as Name and Email Address.
• Click Pay Now.
  • Stripe Checkout form pops up. 
  • They choose Alipay or Credit Card 
• They submit payment. 
  • Payment made via WP Simple Payments Pro and Stripe + Alipay
  • Payment hits Stripe
    • Zapier to make an entry in Salesforce that a payment has been recieved. 
    • Auto email the purchaser to ask them to fill in profile form
• They click on a link to open profile form - created in Form Assembly. 
  • They submit the profile form. 
    • Data updated back into Salesforce. 
• Digital download email sent to purchaser. 

This is such a crappy experience. 

Nicer Solution

It should be as simple as:

• WordPress page with Buy Now button.
• Click Buy Now.
  • They fill in all profile details and payment details. 
  • They choose Alipay or Credit Card 
• They submit form. 
  • Payment goes through to stripe. 
  • Form updated in background to say payment has been made. 
  • Form data submitted to Salesforce. 
• Digital download email sent to purchaser.

But I can NOT find a way to do this. 

Any suggestions?