Add Client ID to change email API call

lib/api/WP_Auth0_Api_Change_Email.php

@@ -66,6 +66,7 @@ public function call( $user_id = null, $email = null ) {
 			->add_body( 'email', $email )
 			// Email is either changed by an admin or verified by WP.
 			->add_body( 'email_verified', true )
+			->add_body( 'client_id', $this->options->get( 'client_id' ) )
 			->patch()
 			->handle_response( __METHOD__ );
 	}

tests/testApiChangeEmail.php

@@ -68,6 +68,7 @@ public function testThatFailedApiReturnsFalse() {
 	public function testThatApiCallIsFormedCorrectly() {
 		$this->startHttpHalting();
 		self::$opts->set( 'domain', self::TEST_DOMAIN );
+		self::$opts->set( 'client_id', '__test_client_id__' );
 
 		// Should succeed with a user_id + provider and set_bearer returning true.
 		$change_email = $this->getStub( true );
@@ -86,7 +87,10 @@ public function testThatApiCallIsFormedCorrectly() {
 		$this->assertEquals( 'PATCH', $decoded_res['method'] );
 		$this->assertArrayHasKey( 'email', $decoded_res['body'] );
 		$this->assertEquals( '[email protected]', $decoded_res['body']['email'] );
+		$this->assertArrayHasKey( 'email_verified', $decoded_res['body'] );
 		$this->assertTrue( $decoded_res['body']['email_verified'] );
+		$this->assertArrayHasKey( 'client_id', $decoded_res['body'] );
+		$this->assertEquals( '__test_client_id__', $decoded_res['body']['client_id'] );
 	}
 
 	/**