diff --git a/.circleci/config.yml b/.circleci/config.yml
index 12ee46f94d..8750294481 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -987,6 +987,9 @@ workflows:
           build_type: "debug"
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - test:
           name: test_defaults_bc7_release
           flavor: "defaults"
@@ -994,6 +997,9 @@ workflows:
           build_type: "release"
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - test:
           name: test_cec_<< matrix.build_type >>
           flavor: "customEntitlementComputation"
@@ -1003,6 +1009,9 @@ workflows:
           matrix:
             parameters:
               build_type: ["debug", "release"]
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       # Special case for defaults BC8 release with kover
       - test:
           name: test_defaults_bc8_release
@@ -1012,54 +1021,105 @@ workflows:
           run_kover: true
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - verify-compatibility:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - lint:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - detekt:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - metalava:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - assemble-purchase-tester:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - assemble-paywall-tester-release:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - assemble-rct-tester-release:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - assemble-admob-integration-sample-app:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - test_dokka_hide_internal:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - test-galaxy:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - run-backend-integration-tests:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - record-and-upload-paparazzi-revenuecatui-snapshots:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - run-revenuecatui-ui-tests:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - emerge_purchases_ui_snapshot_tests:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - emerge_size_analysis_tests:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - run-maestro-e2e-tests:
           requires:
             - prepare-tests
+          # FIXME We only need read access here.
+          context:
+            - github-packages-publishing
       - run-integration-tests:
           requires:
             - prepare-tests
diff --git a/purchases/build.gradle.kts b/purchases/build.gradle.kts
index 71b89a2b9f..5432703275 100644
--- a/purchases/build.gradle.kts
+++ b/purchases/build.gradle.kts
@@ -233,6 +233,7 @@ dependencies {
     implementation(libs.tink)
     implementation(libs.playServices.ads.identifier)
     implementation(libs.coroutines.core)
+    implementation("com.revenuecat.purchases:purchases-core:0.0.0-rust-SNAPSHOT")
     "bc8Api"(libs.billing.bc8)
     "bc7Api"(libs.billing.bc7)
 
diff --git a/purchases/src/defaults/kotlin/com/revenuecat/purchases/NativeHttpClient.kt b/purchases/src/defaults/kotlin/com/revenuecat/purchases/NativeHttpClient.kt
new file mode 100644
index 0000000000..980822fcce
--- /dev/null
+++ b/purchases/src/defaults/kotlin/com/revenuecat/purchases/NativeHttpClient.kt
@@ -0,0 +1,25 @@
+package com.revenuecat.purchases
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import uniffi.purchases_core.HttpClient
+import uniffi.purchases_core.HttpException
+import java.net.URL
+
+/**
+ * PoC: Kotlin implementation of the Rust `HttpClient` foreign trait.
+ * Rust calls `fetch(url)` on this object and awaits the result.
+ */
+internal class NativeHttpClient : HttpClient {
+
+    override suspend fun fetch(url: String): String {
+        return withContext(Dispatchers.IO) {
+            try {
+                URL(url).readText()
+            } catch (e: Exception) {
+                throw HttpException.RequestFailed("${e.javaClass.simpleName}: ${e.message}")
+            }
+        }
+    }
+
+}
diff --git a/purchases/src/defaults/kotlin/com/revenuecat/purchases/Purchases.kt b/purchases/src/defaults/kotlin/com/revenuecat/purchases/Purchases.kt
index 4a7f723a39..4bb0fe926c 100644
--- a/purchases/src/defaults/kotlin/com/revenuecat/purchases/Purchases.kt
+++ b/purchases/src/defaults/kotlin/com/revenuecat/purchases/Purchases.kt
@@ -15,6 +15,9 @@ import com.revenuecat.purchases.common.errorLog
 import com.revenuecat.purchases.common.events.FeatureEvent
 import com.revenuecat.purchases.common.infoLog
 import com.revenuecat.purchases.common.log
+import uniffi.purchases_core.add
+import uniffi.purchases_core.fetchWithNative
+import uniffi.purchases_core.performOperation
 import com.revenuecat.purchases.customercenter.CustomerCenterListener
 import com.revenuecat.purchases.deeplinks.DeepLinkParser
 import com.revenuecat.purchases.interfaces.Callback
@@ -43,6 +46,10 @@ import com.revenuecat.purchases.strings.BillingStrings
 import com.revenuecat.purchases.strings.ConfigureStrings
 import com.revenuecat.purchases.utils.DefaultIsDebugBuildProvider
 import com.revenuecat.purchases.virtualcurrencies.VirtualCurrencies
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import uniffi.purchases_core.HttpException
+import uniffi.purchases_core.OperationMode
 import java.net.URL
 import java.util.Locale
 
@@ -1283,6 +1290,32 @@ public class Purchases internal constructor(
         public fun configure(
             configuration: PurchasesConfiguration,
         ): Purchases {
+            // Call Rust add() function to verify integration
+            val rustResult = add(2uL, 3uL)
+            infoLog { "Rust add(2, 3) = $rustResult" }
+            GlobalScope.launch {
+                val successResult = performOperation(OperationMode.SUCCESS)
+                errorLog { "Operation result in Rust: $successResult" }
+                try {
+                    val failureResult = performOperation(OperationMode.ERROR)
+                } catch (e: Exception) {
+                    errorLog(e) { "Error performing operation in Rust" }
+                }
+                try {
+                    val timeoutResult = performOperation(OperationMode.TIMEOUT)
+                } catch (e: Exception) {
+                    errorLog(e) { "Timeout performing operation in Rust" }
+                }
+
+                // PoC: 2-way communication — Rust calls back into Kotlin via HttpClient
+                try {
+                    val result = fetchWithNative(NativeHttpClient(), "https://httpbin.org/get")
+                    infoLog { "[Android] Rust round-trip result: $result" }
+                } catch (e: Exception) {
+                    errorLog(e) { "[Android] Rust round-trip error" }
+                }
+            }
+
             if (isConfigured) {
                 if (backingFieldSharedInstance?.purchasesOrchestrator?.currentConfiguration == configuration) {
                     infoLog { ConfigureStrings.INSTANCE_ALREADY_EXISTS_WITH_SAME_CONFIG }
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 1c1f4f833a..69e676ae7f 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -88,6 +88,16 @@ dependencyResolutionManagement {
         // fallback for the rest of the dependencies
         mavenCentral()
 
+        // GitHub Packages for purchases-core Rust library
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/RevenueCat/purchases-core")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR") ?: ""
+                password = System.getenv("GITHUB_TOKEN") ?: ""
+            }
+        }
+
         // Local Samsung IAP SDK AAR
         flatDir {
             dirs(samsungIapSdkDir)
diff --git a/test-apps/sdksizetesting/settings.gradle.kts b/test-apps/sdksizetesting/settings.gradle.kts
index c7b145085d..dc056c7fce 100644
--- a/test-apps/sdksizetesting/settings.gradle.kts
+++ b/test-apps/sdksizetesting/settings.gradle.kts
@@ -21,6 +21,21 @@ dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {
         mavenLocal()
+        // GitHub Packages for purchases-core Rust library (transitive dependency)
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/RevenueCat/purchases-core")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR") ?: ""
+                password = System.getenv("GITHUB_TOKEN") ?: ""
+            }
+            content {
+                // Only fetch purchases-core from GitHub Packages
+                includeModule("com.revenuecat.purchases", "purchases-core")
+                includeModule("com.revenuecat.purchases", "purchases-core-android")
+                includeModule("com.revenuecat.purchases", "purchases-core-jvm")
+            }
+        }
         google {
             content {
                 // Exclude to make sure we use dependency from mavenLocal