universalsettle-api 0.2.1

X402-inspired settlement program for any token on Solana
Documentation 
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use steel::*;

#[derive(Debug, Error, Clone, Copy, PartialEq, Eq, IntoPrimitive)]
#[repr(u32)]
pub enum SettlementError {
    #[error("Invalid token account")]
    InvalidTokenAccount = 0,
    #[error("Insufficient balance")]
    InsufficientBalance = 1,
    #[error("Fee calculation overflow")]
    FeeOverflow = 2,
    #[error("Invalid fee rate")]
    InvalidFeeRate = 3,
    #[error("Fee destination mismatch")]
    FeeDestinationMismatch = 4,

    // Authority Errors
    #[error("The authority is invalid")]
    InvalidAuthority = 5,
    #[error("The authority is unchanged")]
    AuthorityUnchanged = 6,
    #[error("Only the authority can perform this action")]
    Unauthorized = 7,
    #[error("Authority transfer delay period has not elapsed")]
    AuthorityTransferTooEarly = 8,

    // Amount Validation Errors
    #[error("Settlement amount is zero")]
    InvalidAmount = 9,

    #[error("Unsupported Token-2022 mint extension")]
    UnsupportedTokenExtension = 10,
}

error!(SettlementError);