Check out the documentation here.
View the demo shop here.
"sandbox_client_id": "AXUqNfhqTYDpQOY_4K-14IaVbdYkm4xP3kCnZ7rffl3GZAiVakAnivZsGsx51GeSl-pGFhDj4OfYBLfF",
"sandbox_client_secret": "EDyB_-rYrz1oCZq26TuaD8lzv4g73RFRl7dbd0swohVAvJAzs142zIcd8uwnsI-adWWdCeYDshu9hR5T",