Consolidate gateways implementation - step II (#7944)

Co-authored-by: Timur Karimov <[email protected]>
Co-authored-by: Timur Karimov <[email protected]>

changelog/cleanup-upe-gateways-II

@@ -0,0 +1,4 @@
+Significance: minor
+Type: dev
+
+Cleanup the deprecated payment gateway processing - part VI

client/checkout/api/index.js

@@ -440,39 +440,6 @@ export default class WCPayAPI {
 			} );
 	}
 
-	/**
-	 * Process checkout and update payment intent via AJAX.
-	 *
-	 * @param {string} paymentIntentId ID of payment intent to be updated.
-	 * @param {Object} fields Checkout fields.
-	 * @param {string} fingerprint User fingerprint.
-	 * @return {Promise} Promise containing redirect URL for UPE element.
-	 */
-	processCheckout( paymentIntentId, fields, fingerprint ) {
-		return this.request(
-			buildAjaxURL( getConfig( 'wcAjaxUrl' ), 'checkout', '' ),
-			{
-				...fields,
-				wc_payment_intent_id: paymentIntentId,
-				'wcpay-fingerprint': fingerprint,
-			}
-		)
-			.then( ( response ) => {
-				if ( response.result === 'failure' ) {
-					throw new Error( response.messages );
-				}
-				return response;
-			} )
-			.catch( ( error ) => {
-				if ( error.message ) {
-					throw error;
-				} else {
-					// Covers the case of error on the Ajaxrequest.
-					throw new Error( error.statusText );
-				}
-			} );
-	}
-
 	/**
 	 * Submits shipping address to get available shipping options
 	 * from Payment Request button.