Artem Maitnian focused on enhancing the reliability of the payment flow within the team-monite/monite-sdk repository, addressing a critical issue in the Payment Button integration. Using TypeScript and React, Artem implemented defensive callback handling to ensure that the onPay callback executes when provided, with a fallback to a default handler to prevent broken payment initiations. This targeted fix improved the SDK’s resilience and reduced potential integration errors, directly supporting smoother checkout experiences for end users. The work demonstrated careful attention to stability and business value, delivering a minimal-risk change that strengthened the SDK’s API surface for front end developers.