Hi @lancewang200,
Please check out the following webinars on using two-way SSL and test on Postman.
How to configure two-way SSL and test on Postman:
https://community.developer.visa.com/t5/Webinars/Configure-Two-way-SSL-with-openSSL-and-Test-on-Post...
How to run the Hello World API with Two-way SSL on Postman:
https://community.developer.visa.com/t5/Two-way-SSL-X-Pay-Token/How-to-run-the-Hello-World-API-with-...
Hope this helps, please let us know if you have questions.
Best,
Stacey
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