diff --git a/internal/common/types.go b/internal/common/types.go
new file mode 100644
index 0000000..9edcc89
--- /dev/null
+++ b/internal/common/types.go
@@ -0,0 +1,37 @@
+package common
+
+// Convenience types
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type (
+	PyTimestamp time.Time
+	KeepZero    float64
+)
+
+func (f KeepZero) MarshalJSON() ([]byte, error) {
+	if float64(f) == float64(int(f)) {
+		return []byte(strconv.FormatFloat(float64(f), 'f', 1, 32)), nil
+	}
+	return []byte(strconv.FormatFloat(float64(f), 'f', -1, 32)), nil
+}
+
+const PytTimeFormat = "2006-01-02T15:04:05.999999-07:00"
+
+func (t *PyTimestamp) MarshalJSON() ([]byte, error) {
+	rv := fmt.Sprintf("%q", time.Time(*t).Format(PytTimeFormat))
+	return []byte(rv), nil
+}
+
+func (t *PyTimestamp) UnmarshalJSON(b []byte) error {
+	s := strings.Trim(string(b), `"`)
+	tm, err := time.Parse(PytTimeFormat, s)
+	*t = PyTimestamp(tm)
+
+	return err
+}
diff --git a/pkg/auth/session.go b/pkg/auth/session.go
index 9532ebd..fd047e5 100644
--- a/pkg/auth/session.go
+++ b/pkg/auth/session.go
@@ -2,62 +2,36 @@ package auth
 
 import (
 	"encoding/json"
-	"fmt"
 	"net/http"
-	"strconv"
-	"strings"
 	"time"
 
 	"github.com/labstack/echo/v4"
 
+	"dynatron.me/x/blasphem/internal/common"
 	"dynatron.me/x/blasphem/internal/generate"
 	"dynatron.me/x/blasphem/pkg/auth/provider"
 )
 
 type (
 	TokenType      string
-	TokenTimestamp time.Time
 	RefreshTokenID string
-	ExpireSecs     float64
 )
 
-func (f ExpireSecs) MarshalJSON() ([]byte, error) {
-	if float64(f) == float64(int(f)) {
-		return []byte(strconv.FormatFloat(float64(f), 'f', 1, 32)), nil
-	}
-	return []byte(strconv.FormatFloat(float64(f), 'f', -1, 32)), nil
-}
-
-const PytTimeFormat = "2006-01-02T15:04:05.999999-07:00"
-
-func (t *TokenTimestamp) MarshalJSON() ([]byte, error) {
-	rv := fmt.Sprintf("%q", time.Time(*t).Format(PytTimeFormat))
-	return []byte(rv), nil
-}
-
-func (t *TokenTimestamp) UnmarshalJSON(b []byte) error {
-	s := strings.Trim(string(b), `"`)
-	tm, err := time.Parse(PytTimeFormat, s)
-	*t = TokenTimestamp(tm)
-
-	return err
-}
-
 type RefreshToken struct {
-	ID                    RefreshTokenID  `json:"id"`
-	UserID                UserID          `json:"user_id"`
-	ClientID              *ClientID       `json:"client_id"`
-	ClientName            *string         `json:"client_name"`
-	ClientIcon            *string         `json:"client_icon"`
-	TokenType             TokenType       `json:"token_type"`
-	CreatedAt             *TokenTimestamp `json:"created_at"`
-	AccessTokenExpiration ExpireSecs      `json:"access_token_expiration"`
-	Token                 string          `json:"token"`
-	JWTKey                string          `json:"jwt_key"`
-	LastUsedAt            *TokenTimestamp `json:"last_used_at"`
-	LastUsedIP            *string         `json:"last_used_ip"`
-	CredentialID          *CredID         `json:"credential_id"`
-	Version               *string         `json:"version"`
+	ID                    RefreshTokenID      `json:"id"`
+	UserID                UserID              `json:"user_id"`
+	ClientID              *ClientID           `json:"client_id"`
+	ClientName            *string             `json:"client_name"`
+	ClientIcon            *string             `json:"client_icon"`
+	TokenType             TokenType           `json:"token_type"`
+	CreatedAt             *common.PyTimestamp `json:"created_at"`
+	AccessTokenExpiration common.KeepZero     `json:"access_token_expiration"`
+	Token                 string              `json:"token"`
+	JWTKey                string              `json:"jwt_key"`
+	LastUsedAt            *common.PyTimestamp `json:"last_used_at"`
+	LastUsedIP            *string             `json:"last_used_ip"`
+	CredentialID          *CredID             `json:"credential_id"`
+	Version               *string             `json:"version"`
 }
 
 type AccessSessionStore struct {