Category of channel code, as some channels might require more fields during processing
## Enum
* `BANK` (value: `"BANK"`)
* `EWALLET` (value: `"EWALLET"`)
* `OTC` (value: `"OTC"`)
* `XENDIT_ENUM_DEFAULT_FALLBACK` (value: `UNKNOWN_ENUM_VALUE`)
If you encounter UNKNOWN_ENUM_VALUE, it means that this ENUM is unavailable in your current SDK version. Please upgrade to get the newest ENUM.