diff --git a/Yosemite/Yosemite/Stores/DomainStore.swift b/Yosemite/Yosemite/Stores/DomainStore.swift
index e3e4b8d3a7e..166786ca846 100644
--- a/Yosemite/Yosemite/Stores/DomainStore.swift
+++ b/Yosemite/Yosemite/Stores/DomainStore.swift
@@ -48,7 +48,9 @@ private extension DomainStore {
     }
 
     func loadDomains(siteID: Int64, completion: @escaping (Result<[SiteDomain], Error>) -> Void) {
-        // TODO: 8558 - fetch a site's domains from the remote.
-        completion(.success([.init(name: "gotrees.wpcomstaging.com", isPrimary: true, renewalDate: nil)]))
+        Task { @MainActor in
+            let result = await Result { try await remote.loadDomains(siteID: siteID) }
+            completion(result)
+        }
     }
 }
diff --git a/Yosemite/Yosemite/Stores/PaymentStore.swift b/Yosemite/Yosemite/Stores/PaymentStore.swift
index 45ef7c0af31..34e629ed31a 100644
--- a/Yosemite/Yosemite/Stores/PaymentStore.swift
+++ b/Yosemite/Yosemite/Stores/PaymentStore.swift
@@ -62,9 +62,11 @@ private extension PaymentStore {
     }
 
     func loadSiteCurrentPlan(siteID: Int64,
-                             completion: (Result<WPComSitePlan, Error>) -> Void) {
-        // TODO: 8558 - fetch site's current plan
-        completion(.success(.init(hasDomainCredit: true)))
+                             completion: @escaping (Result<WPComSitePlan, Error>) -> Void) {
+        Task { @MainActor in
+            let result = await Result { try await remote.loadSiteCurrentPlan(siteID: siteID) }
+            completion(result)
+        }
     }
 
     func createCart(productID: String,
diff --git a/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockDomainRemote.swift b/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockDomainRemote.swift
index 97874da9932..2bdbfdd8c68 100644
--- a/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockDomainRemote.swift
+++ b/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockDomainRemote.swift
@@ -7,10 +7,18 @@ final class MockDomainRemote {
     /// The results to return in `loadDomainSuggestions`.
     private var loadDomainSuggestionsResult: Result<[FreeDomainSuggestion], Error>?
 
+    /// The results to return in `loadDomains`.
+    private var loadDomainsResult: Result<[SiteDomain], Error>?
+
     /// Returns the value when `loadDomainSuggestions` is called.
     func whenLoadingDomainSuggestions(thenReturn result: Result<[FreeDomainSuggestion], Error>) {
         loadDomainSuggestionsResult = result
     }
+
+    /// Returns the value when `loadDomains` is called.
+    func whenLoadingDomains(thenReturn result: Result<[SiteDomain], Error>) {
+        loadDomainsResult = result
+    }
 }
 
 extension MockDomainRemote: DomainRemoteProtocol {
@@ -23,7 +31,10 @@ extension MockDomainRemote: DomainRemoteProtocol {
     }
 
     func loadDomains(siteID: Int64) async throws -> [SiteDomain] {
-        // TODO: 8558 - Yosemite layer
-        throw NetworkError.notFound
+        guard let result = loadDomainsResult else {
+            XCTFail("Could not find result for loading domains.")
+            throw NetworkError.notFound
+        }
+        return try result.get()
     }
 }
diff --git a/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockPaymentRemote.swift b/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockPaymentRemote.swift
index 9d92e08f907..bd76c87cb28 100644
--- a/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockPaymentRemote.swift
+++ b/Yosemite/YosemiteTests/Mocks/Networking/Remote/MockPaymentRemote.swift
@@ -7,6 +7,9 @@ final class MockPaymentRemote {
     /// The results to return in `loadPlan`.
     private var loadPlanResult: Result<WPComPlan, Error>?
 
+    /// The results to return in `loadSiteCurrentPlan`.
+    private var loadSiteCurrentPlanResult: Result<WPComSitePlan, Error>?
+
     /// The results to return in `createCart`.
     private var createCartResult: Result<Void, Error>?
 
@@ -15,6 +18,11 @@ final class MockPaymentRemote {
         loadPlanResult = result
     }
 
+    /// Returns the value when `loadSiteCurrentPlan` is called.
+    func whenLoadingSiteCurrentPlan(thenReturn result: Result<WPComSitePlan, Error>) {
+        loadSiteCurrentPlanResult = result
+    }
+
     /// Returns the value when `createCart` is called.
     func whenCreatingCart(thenReturn result: Result<Void, Error>) {
         createCartResult = result
@@ -22,7 +30,7 @@ final class MockPaymentRemote {
 }
 
 extension MockPaymentRemote: PaymentRemoteProtocol {
-    func loadPlan(thatMatchesID productID: Int64) async throws -> Networking.WPComPlan {
+    func loadPlan(thatMatchesID productID: Int64) async throws -> WPComPlan {
         guard let result = loadPlanResult else {
             XCTFail("Could not find result for loading a plan.")
             throw NetworkError.notFound
@@ -31,8 +39,11 @@ extension MockPaymentRemote: PaymentRemoteProtocol {
     }
 
     func loadSiteCurrentPlan(siteID: Int64) async throws -> WPComSitePlan {
-        // TODO: 8558 - Yosemite layer
-        throw NetworkError.notFound
+        guard let result = loadSiteCurrentPlanResult else {
+            XCTFail("Could not find result for loading a site's current plan.")
+            throw NetworkError.notFound
+        }
+        return try result.get()
     }
 
     func createCart(siteID: Int64, productID: Int64) async throws {
diff --git a/Yosemite/YosemiteTests/Stores/DomainStoreTests.swift b/Yosemite/YosemiteTests/Stores/DomainStoreTests.swift
index 1f214142e01..14e7584fca6 100644
--- a/Yosemite/YosemiteTests/Stores/DomainStoreTests.swift
+++ b/Yosemite/YosemiteTests/Stores/DomainStoreTests.swift
@@ -33,6 +33,8 @@ final class DomainStoreTests: XCTestCase {
         super.tearDown()
     }
 
+    // MARK: - `loadFreeDomainSuggestions`
+
     func test_loadFreeDomainSuggestions_returns_suggestions_on_success() throws {
         // Given
         remote.whenLoadingDomainSuggestions(thenReturn: .success([.init(name: "freedomaintesting", isFree: false)]))
@@ -68,4 +70,46 @@ final class DomainStoreTests: XCTestCase {
         let error = try XCTUnwrap(result.failure)
         XCTAssertEqual(error as? NetworkError, .timeout)
     }
+
+    // MARK: - `loadDomains`
+
+    func test_loadDomains_returns_domains_on_success() throws {
+        // Given
+        remote.whenLoadingDomains(thenReturn: .success([
+            .init(name: "candy.land", isPrimary: true, renewalDate: .distantFuture),
+            .init(name: "pods.pro", isPrimary: true)
+        ]))
+
+        // When
+        let result: Result<[SiteDomain], Error> = waitFor { promise in
+            self.store.onAction(DomainAction.loadDomains(siteID: 606) { result in
+                promise(result)
+            })
+        }
+
+        // Then
+        XCTAssertTrue(result.isSuccess)
+        let suggestions = try XCTUnwrap(result.get())
+        XCTAssertEqual(suggestions, [
+            .init(name: "candy.land", isPrimary: true, renewalDate: .distantFuture),
+            .init(name: "pods.pro", isPrimary: true)
+        ])
+    }
+
+    func test_loadDomains_returns_error_on_failure() throws {
+        // Given
+        remote.whenLoadingDomains(thenReturn: .failure(NetworkError.timeout))
+
+        // When
+        let result: Result<[SiteDomain], Error> = waitFor { promise in
+            self.store.onAction(DomainAction.loadDomains(siteID: 606) { result in
+                promise(result)
+            })
+        }
+
+        // Then
+        XCTAssertTrue(result.isFailure)
+        let error = try XCTUnwrap(result.failure)
+        XCTAssertEqual(error as? NetworkError, .timeout)
+    }
 }
diff --git a/Yosemite/YosemiteTests/Stores/PaymentStoreTests.swift b/Yosemite/YosemiteTests/Stores/PaymentStoreTests.swift
index c4d3e347b82..95a497394fc 100644
--- a/Yosemite/YosemiteTests/Stores/PaymentStoreTests.swift
+++ b/Yosemite/YosemiteTests/Stores/PaymentStoreTests.swift
@@ -70,6 +70,42 @@ final class PaymentStoreTests: XCTestCase {
         XCTAssertEqual(error as? NetworkError, .timeout)
     }
 
+    // MARK: - `loadSiteCurrentPlan`
+
+    func test_loadSiteCurrentPlan_returns_plan_on_success() throws {
+        // Given
+        remote.whenLoadingSiteCurrentPlan(thenReturn: .success(.init(hasDomainCredit: true)))
+
+        // When
+        let result = waitFor { promise in
+            self.store.onAction(PaymentAction.loadSiteCurrentPlan(siteID: 645) { result in
+                promise(result)
+            })
+        }
+
+        // Then
+        XCTAssertTrue(result.isSuccess)
+        let plan = try XCTUnwrap(result.get())
+        XCTAssertEqual(plan, .init(hasDomainCredit: true))
+    }
+
+    func test_loadSiteCurrentPlan_returns_failure_on_error() throws {
+        // Given
+        remote.whenLoadingSiteCurrentPlan(thenReturn: .failure(NetworkError.timeout))
+
+        // When
+        let result = waitFor { promise in
+            self.store.onAction(PaymentAction.loadSiteCurrentPlan(siteID: 645) { result in
+                promise(result)
+            })
+        }
+
+        // Then
+        XCTAssertTrue(result.isFailure)
+        let error = try XCTUnwrap(result.failure)
+        XCTAssertEqual(error as? NetworkError, .timeout)
+    }
+
     // MARK: - `createCart`
 
     func test_createCart_returns_on_success() throws {