FRDU:IsValidFriendCode
Request
| Index Word | Description | 
|---|---|
| 0 | Header code [0x00260080] | 
| 1-2 | (u64) friend code to validate | 
The friend code can be derived from the textual form of "1234-5678-9012" by stripping the slashes and then converting the string to an integer.
This function just calls FRDU:PrincipalIdToFriendCode with the lower half of the friend code and checks if the checksum byte returned matches the input.
Response
| Index Word | Description | 
|---|---|
| 0 | Header code | 
| 1 | Result code | 
| 2 | 1 if the provided friend code is valid, 0 otherwise |