One-Page Checkout [Support Thread]

[GerriM]

First, thanks to @GerriM for granting me access to her test site so that I could investigate the issues she identified.

There are actually two underlying issues that I've identified and currently opened as issues on the OPC's GitHub repository:

Square payment inputs disappear after shipping-method change
The Square (and possibly other?) payment-method has an external jQuery script that's loaded on a full-page load, so when OPC re-loaded only the payment-selection block, that processing didn't kick in ... resulting in no input fields for the Square credit card information.

My current approach, validated by @GerriM, has its limitations. For the Square module to operate properly when the shipping method changes, it's necessary to not re-load the payment-choices block. Unfortunately, there are payment methods that are dependent on the shipping method selected (like enabling a Cash payment only when the shipping-method is store-pickup), so these payment methods absolutely require that the payment-choices' block be updated on a shipping method change.

The approach I plan to take (unless a better solution is proposed) is to add another configuration value to the One-Page Checkout Configuration, allowing a store-owner to identify payment methods that require no reload of the payment-choices' block; that setting will be initialized to identify the square method by default. What this means to store-owners utilizing OPC is that you can't have a combination of payment methods that require the block to be updated and those that require the block not to be updated.

If anyone has a better solution to the issue, I'm open to suggestions!

Taxed order-totals 'lose' their tax on payment method update.
This one was caused by the payment-method update's AJAX not initializing the order's shipping- and payment-classes prior to requesting the order-total modules to perform their calculations.

I'll be updating the OPC's GitHub in the morning with my current changes.

Your solution solved all issues for me. Thank you sooo much. You’re my hero!! OPC is a great plugin. And thanks to Dr Byte for his Square plugin assistance also.