PaymentGateway type.

[kidunot89]

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What does this implement/fix? Explain your changes.

Adds PaymentGateway type. This type is only queryable threw the paymentGateways connection on the RootQuery.

Example usage

query ( $all: Boolean ) {
	paymentGateways(where:{ all: $all }) {
		nodes {
			id
			title
			description
			icon
		}
	}
}

NOTE: the all where argument are displays even disabled gateways, however the edit_theme_options capability is required

Does this close any currently open issues?

…

Any relevant logs, error output, GraphiQL screenshots, etc?

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Any other comments?

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Where has this been tested?

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