diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0900814..0eea005 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,7 +25,7 @@ jobs:
           - { series: "8.3", patch: "8.3.36" }
           - { series: "8.4", patch: "8.4.27" }
           - { series: "8.5", patch: "8.5.12" }
-        wp-version: ["6.8", "latest"]
+        wp-version: ["6.8", "6.9", "7.0", "latest"]
 
     steps:
       - name: Checkout
@@ -62,7 +62,7 @@ jobs:
         run: npm run env:start
 
       - name: Run PHPUnit
-        run: npx wp-env run tests-cli -- bash -c "cd wp-content/plugins/$(basename "$GITHUB_WORKSPACE") && composer test"
+        run: npx wp-env run tests-cli -- bash -c "cd wp-content/plugins/$(basename "$GITHUB_WORKSPACE") && composer test:unit"
 
       - name: Generate PHPUnit dashboard
         if: always() && hashFiles('tests/phpunit/test-results/junit.xml') != ''
diff --git a/README.md b/README.md
index ffbb062..3205aaa 100644
--- a/README.md
+++ b/README.md
@@ -197,6 +197,34 @@ define( 'BEEHIIV_SSLVERIFY', false ); // optional; local private CA only
 
 Post template for API payloads uses the plugin default `post_template_id`; omit `post_template_id` from the request when unset (`Newsletter\PostSettingsBuilder`).
 
+## WordPress VIP runtime config
+
+On WordPress VIP, the platform defines `VIP_BEEHIIV_CONFIG` before the plugin loads. It is a plain PHP array built from the config form in the VIP Dashboard. The plugin reads it in `Beehiiv\OAuth\Config`. The field is declared in `vip-manifest.yaml`.
+
+| Key            | Type | Required | Effect                                                                 |
+| -------------- | ---- | -------- | ---------------------------------------------------------------------- |
+| `api_base_url` | url  | No       | Overrides the beehiiv API base URL. Empty or invalid values are ignored. |
+
+The plugin resolves the API base URL in this order: `VIP_BEEHIIV_CONFIG['api_base_url']`, then the `BEEHIIV_API_BASE_URL` constant from `wp-config.php`, then the production default. The plugin never fatals on missing or malformed config. It falls back to the next source.
+
+Valid example:
+
+```php
+define( 'VIP_BEEHIIV_CONFIG', [
+	'api_base_url' => 'https://api.example.test/v2',
+] );
+```
+
+Incomplete example (setup in progress, the field saved blank). The plugin ignores the blank value and uses the default API URL:
+
+```php
+define( 'VIP_BEEHIIV_CONFIG', [
+	'api_base_url' => '',
+] );
+```
+
+Test fixtures for the valid, minimal, incomplete and invalid states live in `tests/phpunit/fixtures/`.
+
 ## Linting
 
 ```bash
diff --git a/composer.json b/composer.json
index 60dea71..9b0199e 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,12 @@
 		}
 	},
 	"scripts": {
-		"test": "phpunit -c phpunit.xml.dist"
+		"test": [
+			"@test:unit",
+			"@test:e2e"
+		],
+		"test:unit": "phpunit -c phpunit.xml.dist",
+		"test:e2e": "npx playwright test"
 	},
 	"minimum-stability": "stable",
 	"require": {
diff --git a/includes/OAuth/Config.php b/includes/OAuth/Config.php
index 15a77f5..558b3cf 100644
--- a/includes/OAuth/Config.php
+++ b/includes/OAuth/Config.php
@@ -37,6 +37,16 @@ final class Config {
 	 */
 	private const REGISTRATION_TOKEN = 'BEEHIIV_REGISTRATION_TOKEN_PLACEHOLDER';
 
+	/**
+	 * Constant WordPress VIP defines before the plugin loads, holding a config array.
+	 *
+	 * Derived from the integration slug in `vip-manifest.yaml`. Supported key:
+	 * `api_base_url` (optional URL; empty or invalid values are ignored).
+	 *
+	 * @since 1.1.0
+	 */
+	public const CONSTANT_NAME = 'VIP_BEEHIIV_CONFIG';
+
 	/**
 	 * WP-config.php constant for registration token override.
 	 *
@@ -114,9 +124,76 @@ public static function get_oauth_base_url(): string {
 	 */
 	public static function get_api_base_url(): string {
 
+		$vip_url = self::sanitize_vip_url( self::get_vip_config()['api_base_url'] ?? '' );
+
+		if ( '' !== $vip_url ) {
+			return $vip_url;
+		}
+
 		return self::get_url_constant( self::API_BASE_URL_CONST, self::DEFAULT_API_BASE_URL );
 	}
 
+	/**
+	 * Config array WordPress VIP defines, or an empty array when absent or invalid.
+	 *
+	 * Missing or malformed config is a normal state, never an error: callers
+	 * fall back to the wp-config constant and then the production default.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @return array<string, mixed>
+	 */
+	public static function get_vip_config(): array {
+
+		if ( ! defined( self::CONSTANT_NAME ) ) {
+			return [];
+		}
+
+		// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedConstantFound -- Defined by the VIP platform.
+		return self::parse_vip_config( constant( self::CONSTANT_NAME ) );
+	}
+
+	/**
+	 * Normalize a raw VIP config value to an array.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @param mixed $raw Raw value of the VIP config constant.
+	 *
+	 * @return array<string, mixed>
+	 */
+	public static function parse_vip_config( $raw ): array {
+
+		return is_array( $raw ) ? $raw : [];
+	}
+
+	/**
+	 * Return a usable http(s) URL from a VIP config value, or an empty string.
+	 *
+	 * A missing key, a non-string value, a blank string and a non-http(s) URL
+	 * are all treated the same: unset.
+	 *
+	 * @since 1.1.0
+	 *
+	 * @param mixed $value Raw config value.
+	 *
+	 * @return string
+	 */
+	public static function sanitize_vip_url( $value ): string {
+
+		if ( ! is_string( $value ) ) {
+			return '';
+		}
+
+		$url = trim( $value );
+
+		if ( '' === $url || ! in_array( wp_parse_url( $url, PHP_URL_SCHEME ), [ 'http', 'https' ], true ) ) {
+			return '';
+		}
+
+		return untrailingslashit( $url );
+	}
+
 	/**
 	 * Whether outbound HTTPS requests should verify TLS certificates.
 	 *
diff --git a/tests/phpunit/VipConfigTest.php b/tests/phpunit/VipConfigTest.php
new file mode 100644
index 0000000..397627f
--- /dev/null
+++ b/tests/phpunit/VipConfigTest.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Coverage for the WordPress VIP runtime config reader.
+ *
+ * @package beehiiv
+ */
+
+use Beehiiv\OAuth\Config;
+
+/**
+ * @covers \Beehiiv\OAuth\Config
+ */
+class VipConfigTest extends WP_UnitTestCase {
+
+	/**
+	 * Load a fixture file and return the array it defines.
+	 *
+	 * @param string $name Fixture name without the `config-` prefix.
+	 *
+	 * @return array
+	 */
+	private function fixture( string $name ): array {
+
+		return require __DIR__ . '/fixtures/config-' . $name . '.php';
+	}
+
+	public function test_constant_name_follows_the_manifest_slug(): void {
+
+		$this->assertSame( 'VIP_BEEHIIV_CONFIG', Config::CONSTANT_NAME );
+	}
+
+	public function test_valid_config_supplies_the_api_base_url(): void {
+
+		$config = Config::parse_vip_config( $this->fixture( 'valid' ) );
+
+		$this->assertSame( 'https://api.example.test/v2', Config::sanitize_vip_url( $config['api_base_url'] ) );
+	}
+
+	public function test_minimal_config_leaves_the_api_base_url_unset(): void {
+
+		$config = Config::parse_vip_config( $this->fixture( 'minimal' ) );
+
+		$this->assertSame( '', Config::sanitize_vip_url( $config['api_base_url'] ?? '' ) );
+	}
+
+	public function test_incomplete_config_is_treated_as_unset(): void {
+
+		$config = Config::parse_vip_config( $this->fixture( 'incomplete' ) );
+
+		$this->assertSame( '', Config::sanitize_vip_url( $config['api_base_url'] ) );
+	}
+
+	public function test_invalid_config_is_treated_as_unset(): void {
+
+		$config = Config::parse_vip_config( $this->fixture( 'invalid' ) );
+
+		$this->assertSame( '', Config::sanitize_vip_url( $config['api_base_url'] ) );
+	}
+
+	/**
+	 * @dataProvider non_array_values
+	 *
+	 * @param mixed $raw Value the constant could hold.
+	 */
+	public function test_non_array_constant_value_never_fatals( $raw ): void {
+
+		$this->assertSame( [], Config::parse_vip_config( $raw ) );
+	}
+
+	public function non_array_values(): array {
+
+		return [
+			'null'   => [ null ],
+			'string' => [ 'https://example.test' ],
+			'int'    => [ 1 ],
+			'bool'   => [ false ],
+		];
+	}
+
+	/**
+	 * @dataProvider unusable_urls
+	 *
+	 * @param mixed $value Raw field value.
+	 */
+	public function test_unusable_url_values_are_ignored( $value ): void {
+
+		$this->assertSame( '', Config::sanitize_vip_url( $value ) );
+	}
+
+	public function unusable_urls(): array {
+
+		return [
+			'null'        => [ null ],
+			'array'       => [ [ 'x' ] ],
+			'blank'       => [ '' ],
+			'whitespace'  => [ '   ' ],
+			'no scheme'   => [ 'api.example.test' ],
+			'ftp scheme'  => [ 'ftp://api.example.test' ],
+			'javascript'  => [ 'javascript:alert(1)' ],
+		];
+	}
+
+	public function test_absent_constant_falls_back_to_the_default_api_base_url(): void {
+
+		$this->assertFalse( defined( Config::CONSTANT_NAME ) );
+		$this->assertSame( [], Config::get_vip_config() );
+		$this->assertStringStartsWith( 'http', Config::get_api_base_url() );
+	}
+}
diff --git a/tests/phpunit/fixtures/config-incomplete.php b/tests/phpunit/fixtures/config-incomplete.php
new file mode 100644
index 0000000..36b2868
--- /dev/null
+++ b/tests/phpunit/fixtures/config-incomplete.php
@@ -0,0 +1,10 @@
+<?php
+/**
+ * VIP config fixture: setup in progress, the form field saved blank.
+ *
+ * @package beehiiv
+ */
+
+return [
+	'api_base_url' => '   ',
+];
diff --git a/tests/phpunit/fixtures/config-invalid.php b/tests/phpunit/fixtures/config-invalid.php
new file mode 100644
index 0000000..5b53675
--- /dev/null
+++ b/tests/phpunit/fixtures/config-invalid.php
@@ -0,0 +1,10 @@
+<?php
+/**
+ * VIP config fixture: wrong value type and a non-http URL.
+ *
+ * @package beehiiv
+ */
+
+return [
+	'api_base_url' => [ 'not', 'a', 'string' ],
+];
diff --git a/tests/phpunit/fixtures/config-minimal.php b/tests/phpunit/fixtures/config-minimal.php
new file mode 100644
index 0000000..2b3b35b
--- /dev/null
+++ b/tests/phpunit/fixtures/config-minimal.php
@@ -0,0 +1,8 @@
+<?php
+/**
+ * VIP config fixture: no keys set. No field is required, so this is complete.
+ *
+ * @package beehiiv
+ */
+
+return [];
diff --git a/tests/phpunit/fixtures/config-valid.php b/tests/phpunit/fixtures/config-valid.php
new file mode 100644
index 0000000..84adbf4
--- /dev/null
+++ b/tests/phpunit/fixtures/config-valid.php
@@ -0,0 +1,10 @@
+<?php
+/**
+ * VIP config fixture: every supported key set to a valid value.
+ *
+ * @package beehiiv
+ */
+
+return [
+	'api_base_url' => 'https://api.example.test/v2/',
+];
diff --git a/vip-manifest.yaml b/vip-manifest.yaml
new file mode 100644
index 0000000..0438820
--- /dev/null
+++ b/vip-manifest.yaml
@@ -0,0 +1,36 @@
+# yaml-language-server: $schema=./vip-manifest.schema.json
+
+manifest_version: 2
+manifest_kind: vip-integration-handoff
+
+integration:
+  slug: beehiiv
+  display_name: beehiiv
+  summary: Publish WordPress posts as newsletters and grow your audience with beehiiv.
+  partner:
+    name: beehiiv
+    support_contact: https://www.beehiiv.com/support
+
+documentation:
+  public_url: https://www.beehiiv.com/support
+
+runtime:
+  wordpress_plugin:
+    folder: beehiiv
+    entry_file: beehiiv.php
+    php_namespace: 'Beehiiv'
+    scope: site
+
+runtime_config:
+  fields:
+    - key: api_base_url
+      label: API base URL
+      type: url
+      help: Base URL for the beehiiv API. Leave empty to use the default.
+      nullable: true
+
+release:
+  plugin_version: 1.1.0
+  version_strategy: latest
+  migration_required: false
+  changelog: Adds newsletter title and subtitle, per-post publication choice, and test email send from the post editor.