curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Credentials/api/v1/credentials/{provider}/auth/init

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "AuthUrl": "<string>",
  "State": "<string>",
  "CodeVerifier": "<string>",
  "RedirectUri": "<string>",
  "PortalUri": "<string>"
}