Pass email and phone from MPE to Link Login pane

StripeCore/StripeCore/Source/Connections Bindings/ElementsSessionContext.swift

@@ -14,19 +14,33 @@ import Foundation
         case setup(String)
     }
 
+    /// These fields will be used to prefill the Financial Connections Link Login pane.
+    @_spi(STP) public struct PrefillDetails {
+        @_spi(STP) public let email: String?
+        @_spi(STP) public let phoneNumber: String?
+
+        @_spi(STP) public init(email: String?, phoneNumber: String?) {
+            self.email = email
+            self.phoneNumber = phoneNumber
+        }
+    }
+
     @_spi(STP) public let amount: Int?
     @_spi(STP) public let currency: String?
+    @_spi(STP) public let prefillDetails: PrefillDetails?
     @_spi(STP) public let intentId: IntentID?
     @_spi(STP) public let linkMode: LinkMode?
 
     @_spi(STP) public init(
         amount: Int?,
         currency: String?,
+        prefillDetails: PrefillDetails?,
         intentId: IntentID?,
         linkMode: LinkMode?
     ) {
         self.amount = amount
         self.currency = currency
+        self.prefillDetails = prefillDetails
         self.intentId = intentId
         self.linkMode = linkMode
     }

StripeFinancialConnections/StripeFinancialConnections/Source/Native/LinkLogin/LinkLoginDataSource.swift

@@ -10,6 +10,7 @@ import Foundation
 
 protocol LinkLoginDataSource: AnyObject {
     var manifest: FinancialConnectionsSessionManifest { get }
+    var elementsSessionContext: ElementsSessionContext? { get }
     var analyticsClient: FinancialConnectionsAnalyticsClient { get }
 
     func synchronize() -> Future<FinancialConnectionsLinkLoginPane>
@@ -28,12 +29,12 @@ final class LinkLoginDataSourceImplementation: LinkLoginDataSource {
     private static let deallocatedError = FinancialConnectionsSheetError.unknown(debugDescription: "data source deallocated")
 
     let manifest: FinancialConnectionsSessionManifest
+    let elementsSessionContext: ElementsSessionContext?
     let analyticsClient: FinancialConnectionsAnalyticsClient
 
     private let clientSecret: String
     private let returnURL: String?
     private let apiClient: FinancialConnectionsAPIClient
-    private let elementsSessionContext: ElementsSessionContext?
 
     init(
         manifest: FinancialConnectionsSessionManifest,

StripeFinancialConnections/StripeFinancialConnections/Source/Native/LinkLogin/LinkLoginViewController.swift

@@ -118,9 +118,12 @@ final class LinkLoginViewController: UIViewController {
         paneLayoutView?.scrollView.keyboardDismissMode = .onDrag
         #endif
 
-        let emailAddress = dataSource.manifest.accountholderCustomerEmailAddress
+        let emailAddress = dataSource.manifest.accountholderCustomerEmailAddress ?? dataSource.elementsSessionContext?.prefillDetails?.email
         if let emailAddress, !emailAddress.isEmpty {
             formView.prefillEmailAddress(emailAddress)
+
+            let phoneNumber = dataSource.manifest.accountholderPhoneNumber ?? dataSource.elementsSessionContext?.prefillDetails?.phoneNumber
+            formView.prefillPhoneNumber(phoneNumber)
         } else {
             // Slightly delay opening the keyboard to avoid a janky animation.
             DispatchQueue.main.asyncAfter(deadline: .now() + 0.25) { [weak self] in

StripeFinancialConnections/StripeFinancialConnections/Source/Native/NetworkingLinkSignupPane/LinkSignupFormView.swift

@@ -97,6 +97,13 @@ final class LinkSignupFormView: UIView {
         emailTextField.text = emailAddress
     }
 
+    func prefillPhoneNumber(_ phoneNumber: String?) {
+        guard let phoneNumber, !phoneNumber.isEmpty else {
+            return
+        }
+        phoneTextField.text = phoneNumber
+    }
+
     func beginEditingEmailAddressField() {
         _ = emailTextField.becomeFirstResponder()
     }

StripePaymentSheet/StripePaymentSheet/Source/PaymentSheet/ViewControllers/PaymentMethodFormViewController.swift

@@ -219,10 +219,15 @@ extension PaymentMethodFormViewController {
             }
         }()
 
+        let prefillDetails = ElementsSessionContext.PrefillDetails(
+            email: instantDebitsFormElement?.email ?? configuration.defaultBillingDetails.name,
+            phoneNumber: instantDebitsFormElement?.phone ?? configuration.defaultBillingDetails.phone
+        )
         let linkMode = elementsSession.linkSettings?.linkMode
         return ElementsSessionContext(
             amount: intent.amount,
             currency: intent.currency,
+            prefillDetails: prefillDetails,
             intentId: intentId,
             linkMode: linkMode
         )