* add logic allowing payment method to be overridden via payment data in request
* hook in to trigger server side processing of stripe payment request
* improvements to shipping data context
- memoize event emitters
- split up emitted events (reduces how often events trigger)
- Include whether rate is being selected in exported data.
* expose `isSelectingRate` value to payment method interface
* fix typo in shipping emitters for emitter type
* include setting of shipping data in payment method success status call
- this also requires changing the nested order of providers in checkout provider
* fix priority logic for event emitters.
- lower priority is supposed to fire before higher priority.
* normalize postal code for comparisons
* move normalize functions into stripe-utils folder
* refactor stripePromise so that it provides a specific instance to each payment method.
This also provides it as a prop to the pm components.
* renadme apple pay express to payment request express
This adds full support for the stripe payment request api instead of just applePay (so GooglePay, MicrosoftPay and ApplePay are now supported).
Also adds numerous fixes to internal logic.
* add handling to skip core checkout validation logic if express payment method is handling payment
Express payment methods have their own internal validation so this removes the need for checkout validating fields. This is also necessary because checkout validation breaks the flow when making a payment using express payment methods because of the order of the flow for these methods.
* splitting out emmitter effects for checkout and improving logic
Splitting up effects limits the potential for firing off emitters more than needed.
* remove unnecessary ref definitions
* fix on cancel action erroring for payment request modal
* ensure unique stripe object for component and canPay
* set default total label if one isn’t configured on the server
* fix order of state changes
* simplify condition
* remove unnecessary dependency
* normalize to uppercase too
* simplify can make payment conditional
* update comment blocks
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