Adds support for payment line items

What’s new

You can now add the line items associated with a payment when creating a PaymentIntent by passing in the payment_details and amount_details parameters.

For more information, read more about payment line items.

Payment Intents can now specify line items. When provided, they result in these benefits:

Cost savings for eligible commercial cards for IC+ users: By passing payment line items, you can participate in the Level 2/Level 3 (L2/L3) program that major card networks administer. For eligible commercial cards, passing line item data can provide interchange fee savings.
Facilitate reconciliation: Passing line item data can also facilitate reconciliation for your customers. For example, if you primarily serve government customers, it will aid the customer in reconciling a purchase against what shows up on their statement.
Improved authorization rates: Payment methods like Klarna and PayPal use line item data in their underwriting models, potentially allowing them to approve more credit based payment options when line items data is passed.

	Change	Resource
	Added	`PaymentIntentAmountDetailsLineItem`
Endpoint	Change	Resource
list	Added	`PaymentIntentAmountDetailsLineItem`
Parameters	Change	Resources or endpoints
amount_details	Added	PaymentIntent#capture PaymentIntent#confirm PaymentIntent#create + 2 more PaymentIntent#increment_authorization PaymentIntent#update
payment_details	Added	PaymentIntent PaymentIntent#capture PaymentIntent#confirm + 3 more PaymentIntent#create PaymentIntent#increment_authorization PaymentIntent#update
discount_amount line_items shipping tax	Added	PaymentIntent. amount_details

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