How secure is authClient.sso.register?

await authClient.sso.register({
    providerId: "example-provider",
    issuer: "https://idp.example.com",
    domain: "example.com",
    oidcConfig: {
        clientId: "client-id",
        clientSecret: "client-secret",
        authorizationEndpoint: "https://idp.example.com/authorize",
        tokenEndpoint: "https://idp.example.com/token",
        jwksEndpoint: "https://idp.example.com/jwks",
        discoveryEndpoint: "https://idp.example.com/.well-known/openid-configuration",
        scopes: ["openid", "email", "profile"],
        pkce: true,
    },
    mapping: {
        id: "sub",
        email: "email",
        emailVerified: "email_verified",
        name: "name",
        image: "picture",
    },
});