stepUpOptions. platformType {#step-up-opts-platform-type}
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Authentication step-up platform type. Include this field when the stepUpOptions.method field is set to `APP_TO_APP`.  
Possible values:

* `iOS`
* `ANDROID`
* `WINDOWS`
* `WEB`  
  When you set this field value to `WEB` and the stepUpOptions.method field is set to `APP_TO_APP`, then the token requestor has opted in to `3-D Secure` Web Step-Up.

Specifications {#step-up-opts-platform-type_Specifications}
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* **Data Type:** Enum

Mapping Information {#step-up-opts-platform-type_Mapping}
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* **REST API Field:** stepUpOptions.platformType
* **Simple Order API Field:** No corresponding field.