Alternative Payment Methods as separate payment gateways (3258, 3259)

[pedrosilva-pt]

This PR includes a setting for selecting separated Alternative Payment Methods and ensures it can process orders. Also ensures WC checkout form is validated before starting the payment process.

Introduces WC payment gateway StandardButtonGateway.php for handling all separated APMs. It also includes APMs in validation logic and payment process.

Acceptance Criteria

Setting for selecting separated Alternative Payment Methods

• Possible selections: all available APMs from the Disable Alternative Payment Methods setting.

A merchant wants to show the iDEAL button inside of the regular PayPal gateway, as per default. So, it wasn’t selected in the Disable Alternative Payment Methods setting. However, the merchant wants all other payment buttons not to appear. Except for Venmo, this should be a separate payment gateway on the Checkout page, independently of the PayPal gateway.

New Venmo payment gateway tab.

When customer selects United States, Venmo payment gateway is shown.

When customer selects Netherlands, iDeal payment gateway is shown in PayPal buttons.

SEPA payment gateway process payment

• As admin ensure PayPal Vaulting is NOT enabled
• Go to Payments / PayPal and add “SEPA-Lastschrift“ in “Separate gateways for selected Alternative Payment Methods“
• Add product to cart and go to checkout page
• Select “Germany” in “Country / Region”
• Select “SEPA-Lastschrift“ payment and click “Sepa“ button
• As we do not have a valid OTP code, use “Have a PayPal account? Log In“ at the bottom of the modal
• Login as PayPal user and complete purchase
  • Payment is processed correctly
  • Payment method is “SEPA-Lastschrift“

Ensure WC checkout form validation before starting the payment process

• Same steps as before but removing one checkout form fill (ex. First name) before clicking “Sepa“ button
• Click “Sepa“ button
  • Error should be displayed in the screen and PayPal modal should be closed automatically

[danieldudzic]

This looks good!