# Integration-Specific Testing source: https://developer.mastercard.com/mastercard-gateway/documentation/testing/int-specific-test/index.md [Hosted Checkout](https://developer.mastercard.com/mastercard-gateway/documentation/build/hosted-checkout/index.md), [Hosted Session](https://developer.mastercard.com/mastercard-gateway/documentation/build/hosted-session/index.md), and [Mobile Integration](https://developer.mastercard.com/mastercard-gateway/documentation/build/mobile-integration/index.md) require testing in addition to the [core testing steps](https://developer.mastercard.com/mastercard-gateway/documentation/testing/index.md#core-testing-steps-all-integrations). ## Hosted Checkout {#hosted-checkout} ### Prerequisites {#prerequisites} Before you start testing your Hosted Session integration, you must complete: * A [Basic integration](https://developer.mastercard.com/mastercard-gateway/documentation/build/hosted-checkout/integrate-hosted-checkout/index.md) using the Hosted Payment Page to collect payment details. ### Test your integration {#test-your-integration} Cover these steps in addition to the [core testing steps](https://developer.mastercard.com/mastercard-gateway/documentation/testing/index.md#core-testing-steps-all-integrations) in your testing: * Create a checkout session. * Redirect the payer to the Hosted Payment Page (HPP). * Handle the redirect or callback after the payment is complete. ## Hosted Session {#hosted-session} ### Prerequisites {#prerequisites-1} Before you start testing your Hosted Session integration, you must complete: * [Basic integration](https://developer.mastercard.com/mastercard-gateway/documentation/build/hosted-session/integrate-hosted-session/index.md) using sessions and hosted fields to gather payment details. ### Test your integration {#test-your-integration-1} Cover these steps in addition to the [core testing steps](https://developer.mastercard.com/mastercard-gateway/documentation/testing/index.md#core-testing-steps-all-integrations) in your testing: * For each supported payment method, test every Operation that requires payer interaction with hosted payment fields. Verify the complete flow, including: * Creating a session * Displaying hosted fields * Updating the session with field values * Submitting a payment transaction by using the session * Verify that any hosted-field customizations work as expected. * Identify transaction responses that require follow-up actions and verify that your integration handles them correctly. ### Enable additional logging for testing {#enable-additional-logging-for-testing} To enable additional logging when testing your Hosted Session integration with a TEST merchant ID, append `?debug=true` to the URL of the [Session JavaScript library](https://developer.mastercard.com/mastercard-gateway/documentation/api-reference/js-libraries/session/index.md) on your payment page. ```html {{host}}/form/version//merchant//session.js?debug=truescript> ``` ## Mobile {#mobile} ### Test your integration {#test-your-integration-2} Cover these steps in addition to the [core testing steps](https://developer.mastercard.com/mastercard-gateway/documentation/testing/index.md#core-testing-steps-all-integrations) in your testing: * For each supported payment method in your mobile app, test the payment flow until the session is updated with the payment details. * Test the EMV 3-D Secure authentication flow, if applicable. * Verify that your app handles common error conditions appropriately, including invalid requests and connectivity issues. * Identify transaction responses that require follow-up actions and verify that your integration handles them correctly. * To test the final payment transaction and any subsequent server-side transactions, follow the instructions in the Hosted Session [Testing Steps](https://developer.mastercard.com/mastercard-gateway/documentation/testing/int-specific-test/index.md#hosted-session). * Test wallet tokens If you support Apple Pay or Google Pay, use the provided test card details to validate wallet functionality. For more information, see [Apple Pay](https://developer.mastercard.com/mastercard-gateway/documentation/payment-methods/digital-wallets/apple-pay/index.md) and [Google Pay](https://developer.mastercard.com/mastercard-gateway/documentation/payment-methods/digital-wallets/google-pay/index.md). ## Browser Payment Testing {#browser-payment-testing} Test your [Browser Payment Integration](https://developer.mastercard.com/mastercard-gateway/documentation/payment-methods/test-brow-pay-int/index.md).