Paypal, Sql, Sso, Splunk, Postman, authentication and access management, MFA, understanding of APIs, Venmo, cloud platform troubleshooting, SPF, DKIM, monitoring and debugging tools, CRM case management tools, Credit Cards, system integrations, zendesk, log analysis utilities, browser developer tools, email deliverability protocols, Salesforce, DMARC, API testing platforms, merchant payment systems