Preconditions:

• Added product
• Defined Shipping method 'Free shipping'
• Defined Payment method

Steps to reproduce:

1. Log in storefront as admin user.
2. Go to /product-catalog page
3. Add product to cart and to go checkout.
4. Being in the checkout select 'Free shipping' delivery method and payment method.
5. Pay for the order.

Actual result:

See attached screenshot.

An error 400 bad request occurred while user trying to pay for an order with selected free shipping method.

Argument '$createStruct->amount' is invalid: Money amount must be gather then 0 EUR

Expected result:

User can pay for an order with selected 'Free shipping' method.