feat(users): Create Decision manager for User Flows (#4518)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/api_models/src/user.rs

@@ -1,4 +1,4 @@
-use common_enums::{PermissionGroup, RoleScope};
+use common_enums::{PermissionGroup, RoleScope, TokenPurpose};
 use common_utils::{crypto::OptionalEncryptableName, pii};
 use masking::Secret;
 
@@ -213,3 +213,21 @@ pub struct UpdateUserAccountDetailsRequest {
     pub name: Option<Secret<String>>,
     pub preferred_merchant_id: Option<String>,
 }
+
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct TokenOnlyQueryParam {
+    pub token_only: Option<bool>,
+}
+
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+pub struct TokenResponse {
+    pub token: Secret<String>,
+    pub token_type: TokenPurpose,
+}
+
+#[derive(Debug, serde::Serialize)]
+#[serde(untagged)]
+pub enum SignInWithTokenResponse {
+    Token(TokenResponse),
+    SignInResponse(SignInResponse),
+}