diff --git a/composer.json b/composer.json
index 923a5167..6fee169f 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         "yoast/phpunit-polyfills": "^1.0"
     },
     "require": {
-        "amzn/amazon-pay-api-sdk-php": "2.5.2",
+        "amzn/amazon-pay-api-sdk-php": "2.6.2",
         "php": "7.*"
     }
 }
diff --git a/composer.lock b/composer.lock
index 0942c74c..51157383 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f8ac084417c133d5c7e6a5e2f177d2b8",
+    "content-hash": "2ca89bcc208c35341a0045d630cdf10c",
     "packages": [
         {
             "name": "amzn/amazon-pay-api-sdk-php",
-            "version": "2.5.2",
+            "version": "2.6.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amzn/amazon-pay-api-sdk-php.git",
-                "reference": "5b38287612427ecb0806d2cc626c92eb49173c6f"
+                "reference": "4583b7320e96e18fe32bef1830d7a968c0cebf49"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amzn/amazon-pay-api-sdk-php/zipball/5b38287612427ecb0806d2cc626c92eb49173c6f",
-                "reference": "5b38287612427ecb0806d2cc626c92eb49173c6f",
+                "url": "https://api.github.com/repos/amzn/amazon-pay-api-sdk-php/zipball/4583b7320e96e18fe32bef1830d7a968c0cebf49",
+                "reference": "4583b7320e96e18fe32bef1830d7a968c0cebf49",
                 "shasum": ""
             },
             "require": {
@@ -57,9 +57,9 @@
             ],
             "support": {
                 "issues": "https://github.com/amzn/amazon-pay-api-sdk-php/issues",
-                "source": "https://github.com/amzn/amazon-pay-api-sdk-php/tree/2.5.2"
+                "source": "https://github.com/amzn/amazon-pay-api-sdk-php/tree/2.6.2"
             },
-            "time": "2023-03-06T12:45:51+00:00"
+            "time": "2023-06-29T07:33:20+00:00"
         },
         {
             "name": "paragonie/constant_time_encoding",
diff --git a/includes/class-wc-amazon-payments-advanced-api-abstract.php b/includes/class-wc-amazon-payments-advanced-api-abstract.php
index ac448a7d..ef708f13 100644
--- a/includes/class-wc-amazon-payments-advanced-api-abstract.php
+++ b/includes/class-wc-amazon-payments-advanced-api-abstract.php
@@ -531,4 +531,18 @@ public static function validate_api_keys() {
 		return false;
 	}
 
+	/**
+	 * Returns extra headers to be added to requests against Amazon Pay API.
+	 *
+	 * @return array
+	 */
+	protected static function get_amazon_pay_platform_headers() {
+		$version_suffix = wc_apa()->get_gateway() instanceof WC_Gateway_Amazon_Payments_Advanced_Legacy ? '-legacy' : '';
+
+		return array(
+			'x-amz-pay-platform-version'   => WC()->version,
+			'x-amz-pay-integrator-version' => wc_apa()->version . $version_suffix,
+			'x-amz-pay-integrator-id'      => static::AMAZON_PAY_FOR_WOOCOMMERCE_SP_ID,
+		);
+	}
 }
diff --git a/includes/class-wc-amazon-payments-advanced-api.php b/includes/class-wc-amazon-payments-advanced-api.php
index cb5eddd8..62f07956 100644
--- a/includes/class-wc-amazon-payments-advanced-api.php
+++ b/includes/class-wc-amazon-payments-advanced-api.php
@@ -75,8 +75,20 @@ public static function validate_api_keys() {
 			$client  = self::get_client();
 			$payload = self::create_checkout_session_params();
 
-			$headers = array( 'x-amz-pay-Idempotency-Key' => uniqid() );
-			$result  = $client->createCheckoutSession( $payload, $headers );
+			$headers = array_merge(
+				array( 'x-amz-pay-Idempotency-Key' => uniqid() ),
+				self::get_amazon_pay_platform_headers()
+			);
+
+			wc_apa()->log(
+				'Validating API keys.',
+				array(
+					'payload' => $payload,
+					'headers' => $headers,
+				)
+			);
+
+			$result = $client->createCheckoutSession( $payload, $headers );
 			if ( ! isset( $result['status'] ) || 201 !== $result['status'] ) {
 				throw new Exception( __( 'Error: API is not responding.', 'woocommerce-gateway-amazon-payments-advanced' ) );
 			}
@@ -99,7 +111,17 @@ public static function validate_api_keys() {
 	 * @return array
 	 */
 	public static function trigger_alexa_notifications( $payload ) {
-		return self::get_client()->deliveryTrackers( $payload );
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			'Enabling Alexa notifications.',
+			array(
+				'payload' => $payload,
+				'headers' => $headers,
+			)
+		);
+
+		return self::get_client()->deliveryTrackers( $payload, $headers );
 	}
 
 	/**
@@ -486,7 +508,17 @@ public static function get_create_checkout_classic_session_config( $payload ) {
 	 */
 	public static function get_checkout_session_data( $checkout_session_id ) {
 		$client = self::get_client();
-		$result = $client->getCheckoutSession( $checkout_session_id );
+
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Retrieving session data for session %s', $checkout_session_id ),
+			array(
+				'headers' => $headers,
+			)
+		);
+
+		$result = $client->getCheckoutSession( $checkout_session_id, $headers );
 		if ( ! isset( $result['status'] ) || 200 !== $result['status'] ) {
 			return new WP_Error( $result['status'], __( 'Error while getting checkout session.', 'woocommerce-gateway-amazon-payments-advanced' ) );
 		}
@@ -533,7 +565,10 @@ protected static function normalize_address( $address ) {
 	public static function update_checkout_session_data( $checkout_session_id, $data = array() ) {
 		$client = self::get_client();
 
-		$headers = self::get_extra_headers( __FUNCTION__ );
+		$headers = array_merge(
+			self::get_extra_headers( __FUNCTION__ ),
+			self::get_amazon_pay_platform_headers()
+		);
 
 		wc_apa()->log(
 			sprintf( 'Checkout Session ID %s', $checkout_session_id ),
@@ -565,9 +600,18 @@ public static function update_checkout_session_data( $checkout_session_id, $data
 	 * @return object|WP_Error API Response, or WP_Error.
 	 */
 	public static function complete_checkout_session( $checkout_session_id, $data = array() ) {
-		$client = self::get_client();
-		wc_apa()->log( sprintf( 'Checkout Session ID %s', $checkout_session_id ), $data );
-		$result = $client->completeCheckoutSession( $checkout_session_id, $data );
+		$client  = self::get_client();
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Completing Checkout Session ID %s', $checkout_session_id ),
+			array(
+				'data'    => $data,
+				'headers' => $headers,
+			)
+		);
+
+		$result = $client->completeCheckoutSession( $checkout_session_id, $data, $headers );
 
 		$response = json_decode( $result['response'] );
 
@@ -619,7 +663,17 @@ public static function get_languages_per_region() {
 	 */
 	public static function get_charge_permission( $charge_permission_id ) {
 		$client = self::get_client();
-		$result = $client->getChargePermission( $charge_permission_id );
+
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Retrieving Charge Permission ID %s', $charge_permission_id ),
+			array(
+				'headers' => $headers,
+			)
+		);
+
+		$result = $client->getChargePermission( $charge_permission_id, $headers );
 
 		$response = json_decode( $result['response'] );
 
@@ -638,7 +692,17 @@ public static function get_charge_permission( $charge_permission_id ) {
 	 */
 	public static function get_charge( $charge_id ) {
 		$client = self::get_client();
-		$result = $client->getCharge( $charge_id );
+
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Retrieving Charge ID %s', $charge_id ),
+			array(
+				'headers' => $headers,
+			)
+		);
+
+		$result = $client->getCharge( $charge_id, $headers );
 
 		$response = json_decode( $result['response'] );
 
@@ -657,7 +721,17 @@ public static function get_charge( $charge_id ) {
 	 */
 	public static function get_refund( $refund_id ) {
 		$client = self::get_client();
-		$result = $client->getRefund( $refund_id );
+
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Retrieving Refund ID %s', $refund_id ),
+			array(
+				'headers' => $headers,
+			)
+		);
+
+		$result = $client->getRefund( $refund_id, $headers );
 
 		$response = json_decode( $result['response'] );
 
@@ -706,7 +780,10 @@ public static function capture_charge( $charge_id, $data = array() ) {
 			// TODO: Test with lower amount of captured than charge (multiple charges per capture).
 		}
 
-		$headers = self::get_extra_headers( __FUNCTION__ );
+		$headers = array_merge(
+			self::get_extra_headers( __FUNCTION__ ),
+			self::get_amazon_pay_platform_headers()
+		);
 
 		wc_apa()->log(
 			sprintf( 'Charge ID %s.', $charge_id ),
@@ -716,15 +793,17 @@ public static function capture_charge( $charge_id, $data = array() ) {
 			)
 		);
 
+		$headers = array_merge(
+			$headers,
+			array(
+				'x-amz-pay-idempotency-key' => self::generate_uuid(),
+			)
+		);
+
 		$result = $client->captureCharge(
 			$charge_id,
 			$data,
-			array_merge(
-				$headers,
-				array(
-					'x-amz-pay-idempotency-key' => self::generate_uuid(),
-				)
-			)
+			$headers
 		);
 
 		$response = json_decode( $result['response'] );
@@ -763,7 +842,10 @@ public static function refund_charge( $charge_id, $amount = null, $data = array(
 			$data['refundAmount']['amount'] = $amount;
 		}
 
-		$headers = self::get_extra_headers( __FUNCTION__ );
+		$headers = array_merge(
+			self::get_extra_headers( __FUNCTION__ ),
+			self::get_amazon_pay_platform_headers()
+		);
 
 		wc_apa()->log(
 			sprintf( 'Charge ID %s.', $charge_id ),
@@ -773,14 +855,16 @@ public static function refund_charge( $charge_id, $amount = null, $data = array(
 			)
 		);
 
+		$headers = array_merge(
+			$headers,
+			array(
+				'x-amz-pay-idempotency-key' => self::generate_uuid(),
+			)
+		);
+
 		$result = $client->createRefund(
 			$data,
-			array_merge(
-				$headers,
-				array(
-					'x-amz-pay-idempotency-key' => self::generate_uuid(),
-				)
-			)
+			$headers
 		);
 
 		$response = json_decode( $result['response'] );
@@ -804,15 +888,27 @@ public static function refund_charge( $charge_id, $amount = null, $data = array(
 	 */
 	public static function cancel_charge( $charge_id, $reason = 'Order Cancelled' ) {
 		$client = self::get_client();
-		wc_apa()->log( sprintf( 'Charge ID %s.', $charge_id ) );
 
-		$result = $client->cancelCharge(
-			$charge_id,
+		$data = array(
+			'cancellationReason' => $reason, // TODO: Make dynamic.
+		);
+
+		$headers = self::get_amazon_pay_platform_headers();
+
+		wc_apa()->log(
+			sprintf( 'Charge ID %s.', $charge_id ),
 			array(
-				'cancellationReason' => $reason, // TODO: Make dynamic.
+				'data'    => $data,
+				'headers' => $headers,
 			)
 		);
 
+		$result = $client->cancelCharge(
+			$charge_id,
+			$data,
+			$headers
+		);
+
 		$response = json_decode( $result['response'] );
 
 		if ( ! isset( $result['status'] ) || ! in_array( $result['status'], array( 200, 201 ), true ) ) {
@@ -927,7 +1023,10 @@ public static function create_charge( $charge_permission_id, $data ) {
 			$data['chargeAmount'] = (array) $charge_permission->limits->amountBalance; // phpcs:ignore WordPress.NamingConventions
 		}
 
-		$headers = self::get_extra_headers( __FUNCTION__ );
+		$headers = array_merge(
+			self::get_extra_headers( __FUNCTION__ ),
+			self::get_amazon_pay_platform_headers()
+		);
 
 		wc_apa()->log(
 			sprintf( 'Charge Permission ID %s.', $charge_permission_id ),
@@ -937,14 +1036,16 @@ public static function create_charge( $charge_permission_id, $data ) {
 			)
 		);
 
+		$headers = array_merge(
+			$headers,
+			array(
+				'x-amz-pay-idempotency-key' => self::generate_uuid(),
+			)
+		);
+
 		$result = $client->createCharge(
 			$data,
-			array_merge(
-				$headers,
-				array(
-					'x-amz-pay-idempotency-key' => self::generate_uuid(),
-				)
-			)
+			$headers
 		);
 
 		$response = json_decode( $result['response'] );
@@ -969,7 +1070,10 @@ public static function create_charge( $charge_permission_id, $data ) {
 	public static function close_charge_permission( $charge_permission_id, $reason = 'Subscription Cancelled' ) {
 		$client = self::get_client();
 
-		$headers = self::get_extra_headers( __FUNCTION__ );
+		$headers = array_merge(
+			self::get_extra_headers( __FUNCTION__ ),
+			self::get_amazon_pay_platform_headers()
+		);
 
 		wc_apa()->log( sprintf( 'Charge Permission ID %s.', $charge_permission_id ), array( 'headers' => $headers ) );