diff --git a/api/proto/game/v1/game.pb.go b/api/proto/game/v1/game.pb.go
index 6ed173eb..53c309d5 100644
--- a/api/proto/game/v1/game.pb.go
+++ b/api/proto/game/v1/game.pb.go
@@ -1192,7 +1192,9 @@ type LaunchGameRequest struct {
 	// Provider adapters pass it through as the game token instead of minting a separate game token.
 	AccessToken string `protobuf:"bytes,7,opt,name=access_token,json=accessToken,proto3" json:"access_token,omitempty"`
 	// country_id 由 gateway 从当前用户资料注入，供 provider 回调订单按国家统计。
-	CountryId     int64 `protobuf:"varint,8,opt,name=country_id,json=countryId,proto3" json:"country_id,omitempty"`
+	CountryId int64 `protobuf:"varint,8,opt,name=country_id,json=countryId,proto3" json:"country_id,omitempty"`
+	// provider_token 是 gateway 签发的短期厂商令牌；仅需要限长令牌的 adapter 使用。
+	ProviderToken string `protobuf:"bytes,9,opt,name=provider_token,json=providerToken,proto3" json:"provider_token,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -1283,6 +1285,13 @@ func (x *LaunchGameRequest) GetCountryId() int64 {
 	return 0
 }
 
+func (x *LaunchGameRequest) GetProviderToken() string {
+	if x != nil {
+		return x.ProviderToken
+	}
+	return ""
+}
+
 type LaunchGameResponse struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	SessionId     string                 `protobuf:"bytes,1,opt,name=session_id,json=sessionId,proto3" json:"session_id,omitempty"`
@@ -6949,7 +6958,7 @@ const file_proto_game_v1_game_proto_rawDesc = "" +
 	"\x14bridge_script_sha256\x18\x03 \x01(\tR\x12bridgeScriptSha256\"~\n" +
 	"\x17GetBridgeScriptResponse\x12=\n" +
 	"\x06config\x18\x01 \x01(\v2%.hyapp.game.v1.GameBridgeScriptConfigR\x06config\x12$\n" +
-	"\x0eserver_time_ms\x18\x02 \x01(\x03R\fserverTimeMs\"\x8e\x02\n" +
+	"\x0eserver_time_ms\x18\x02 \x01(\x03R\fserverTimeMs\"\xb5\x02\n" +
 	"\x11LaunchGameRequest\x12.\n" +
 	"\x04meta\x18\x01 \x01(\v2\x1a.hyapp.game.v1.RequestMetaR\x04meta\x12\x17\n" +
 	"\auser_id\x18\x02 \x01(\x03R\x06userId\x12&\n" +
@@ -6959,7 +6968,8 @@ const file_proto_game_v1_game_proto_rawDesc = "" +
 	"\aroom_id\x18\x06 \x01(\tR\x06roomId\x12!\n" +
 	"\faccess_token\x18\a \x01(\tR\vaccessToken\x12\x1d\n" +
 	"\n" +
-	"country_id\x18\b \x01(\x03R\tcountryId\"\xdf\x01\n" +
+	"country_id\x18\b \x01(\x03R\tcountryId\x12%\n" +
+	"\x0eprovider_token\x18\t \x01(\tR\rproviderToken\"\xdf\x01\n" +
 	"\x12LaunchGameResponse\x12\x1d\n" +
 	"\n" +
 	"session_id\x18\x01 \x01(\tR\tsessionId\x12\x1d\n" +
diff --git a/api/proto/game/v1/game.proto b/api/proto/game/v1/game.proto
index 3b89bc9b..8f73d142 100644
--- a/api/proto/game/v1/game.proto
+++ b/api/proto/game/v1/game.proto
@@ -144,6 +144,8 @@ message LaunchGameRequest {
   string access_token = 7;
   // country_id 由 gateway 从当前用户资料注入，供 provider 回调订单按国家统计。
   int64 country_id = 8;
+  // provider_token 是 gateway 签发的短期厂商令牌；仅需要限长令牌的 adapter 使用。
+  string provider_token = 9;
 }
 
 message LaunchGameResponse {
diff --git a/services/game-service/internal/service/game/amg_adapter_test.go b/services/game-service/internal/service/game/amg_adapter_test.go
index 3f71fd6d..349538d1 100644
--- a/services/game-service/internal/service/game/amg_adapter_test.go
+++ b/services/game-service/internal/service/game/amg_adapter_test.go
@@ -10,6 +10,7 @@ import (
 	"encoding/json"
 	"net/url"
 	"strconv"
+	"strings"
 	"testing"
 	"time"
 
@@ -51,7 +52,8 @@ func TestLaunchGameBuildsAMGURL(t *testing.T) {
 		DisplayUserID: "420001",
 		GameID:        "amg_1001",
 		RoomID:        "room_1",
-		AccessToken:   "app_access_token_amg",
+		AccessToken:   strings.Repeat("full_app_access_token", 40),
+		ProviderToken: "short_amg_provider_token",
 	})
 	if err != nil {
 		t.Fatalf("LaunchGame failed: %v", err)
@@ -67,7 +69,7 @@ func TestLaunchGameBuildsAMGURL(t *testing.T) {
 		t.Fatalf("AMG launch base mismatch: %s", result.LaunchURL)
 	}
 	want := map[string]string{
-		"user_token": "app_access_token_amg",
+		"user_token": "short_amg_provider_token",
 		"app_key":    "kzphamrv01",
 		"room_id":    "room_1",
 		"mini":       "1",
diff --git a/services/game-service/internal/service/game/service.go b/services/game-service/internal/service/game/service.go
index 36118398..bb0d77d1 100644
--- a/services/game-service/internal/service/game/service.go
+++ b/services/game-service/internal/service/game/service.go
@@ -137,6 +137,7 @@ type LaunchCommand struct {
 	RegionID      int64
 	CountryID     int64
 	AccessToken   string
+	ProviderToken string
 }
 
 type LaunchResult struct {
@@ -308,6 +309,11 @@ func (s *Service) LaunchGame(ctx context.Context, command LaunchCommand) (Launch
 	now := s.now()
 	sessionID := "game_sess_" + strconv.FormatInt(now.UnixMilli(), 10) + "_" + randomHex(6)
 	token := strings.TrimSpace(command.AccessToken)
+	if strings.EqualFold(game.AdapterType, gamedomain.AdapterAMGV1) && strings.TrimSpace(command.ProviderToken) != "" {
+		// AMG 限制 user_token 最长 512 字节；Gateway 签发的厂商令牌保留可验签的 App/用户归因，
+		// 且不会把完整登录 JWT 暴露给厂商。滚动发布期旧 Gateway 没有该字段时仍保留原逻辑。
+		token = strings.TrimSpace(command.ProviderToken)
+	}
 	if token == "" {
 		if strings.EqualFold(game.AdapterType, gamedomain.AdapterYomiV4) || strings.EqualFold(game.AdapterType, gamedomain.AdapterLeaderCCV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterZeeOneV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterBaishunV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterVivaGamesV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterReyouV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterZGameV1) || strings.EqualFold(game.AdapterType, gamedomain.AdapterAMGV1) {
 			return LaunchResult{}, xerr.New(xerr.InvalidArgument, "access token is required for provider game launch")
diff --git a/services/game-service/internal/transport/grpc/server.go b/services/game-service/internal/transport/grpc/server.go
index 27305214..8ff8bd25 100644
--- a/services/game-service/internal/transport/grpc/server.go
+++ b/services/game-service/internal/transport/grpc/server.go
@@ -132,6 +132,7 @@ func (s *Server) LaunchGame(ctx context.Context, req *gamev1.LaunchGameRequest)
 		RoomID:        req.GetRoomId(),
 		CountryID:     req.GetCountryId(),
 		AccessToken:   req.GetAccessToken(),
+		ProviderToken: req.GetProviderToken(),
 	})
 	if err != nil {
 		return nil, xerr.ToGRPCError(err)
diff --git a/services/gateway-service/internal/auth/jwt.go b/services/gateway-service/internal/auth/jwt.go
index bad57977..4f11c5c9 100644
--- a/services/gateway-service/internal/auth/jwt.go
+++ b/services/gateway-service/internal/auth/jwt.go
@@ -2,10 +2,13 @@ package auth
 
 import (
 	"context"
+	"crypto/rand"
+	"encoding/hex"
 	"errors"
 	"fmt"
 	"strconv"
 	"strings"
+	"time"
 
 	jwt "github.com/golang-jwt/jwt/v5"
 	"hyapp/pkg/appcode"
@@ -14,6 +17,8 @@ import (
 // ErrAccessTokenExpired 让 transport 精确区分“可通过 refresh 恢复”的 JWT 过期与签名非法/缺失凭证。
 var ErrAccessTokenExpired = errors.New("access token expired")
 
+const gameProviderTokenType = "game_provider"
+
 type contextKey string
 
 const (
@@ -57,6 +62,16 @@ func (v *Verifier) VerifyUserID(header string) (int64, error) {
 
 // Verify 校验 access token 并返回 gateway 入口需要的用户状态快照。
 func (v *Verifier) Verify(header string) (Claims, error) {
+	return v.verify(header, false)
+}
+
+// VerifyGameCallbackToken 同时接受历史 access token 与新的短期游戏令牌。
+// game_provider 令牌只能走厂商回调入口；普通 API 仍由 Verify 拒绝，避免短令牌被当作登录凭证复用。
+func (v *Verifier) VerifyGameCallbackToken(header string) (Claims, error) {
+	return v.verify(header, true)
+}
+
+func (v *Verifier) verify(header string, allowGameProvider bool) (Claims, error) {
 	if !strings.HasPrefix(header, "Bearer ") {
 		return Claims{}, fmt.Errorf("missing bearer token")
 	}
@@ -82,6 +97,11 @@ func (v *Verifier) Verify(header string) (Claims, error) {
 	if !ok {
 		return Claims{}, fmt.Errorf("invalid claims")
 	}
+	tokenType, _ := claims["typ"].(string)
+	tokenType = strings.TrimSpace(tokenType)
+	if tokenType != "" && tokenType != "access" && !(allowGameProvider && tokenType == gameProviderTokenType) {
+		return Claims{}, fmt.Errorf("invalid token type")
+	}
 
 	rawUserID, ok := claims["user_id"].(string)
 	if !ok || strings.TrimSpace(rawUserID) == "" {
@@ -110,6 +130,32 @@ func (v *Verifier) Verify(header string) (Claims, error) {
 	}, nil
 }
 
+// IssueGameProviderToken 把已完成入口鉴权的用户身份压缩成厂商专用 JWT。
+// 令牌只包含回调归因需要的 App、用户、过期时间和随机 ID，避免把不断增长的完整登录 claims 暴露给厂商。
+func (v *Verifier) IssueGameProviderToken(appCodeValue string, userID int64, ttl time.Duration) (string, error) {
+	if v == nil || len(v.secret) == 0 || userID <= 0 || ttl <= 0 {
+		return "", fmt.Errorf("invalid game provider token input")
+	}
+	var nonce [12]byte
+	if _, err := rand.Read(nonce[:]); err != nil {
+		return "", fmt.Errorf("generate game provider token id: %w", err)
+	}
+	now := time.Now().UTC()
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
+		"app_code": appcode.Normalize(appCodeValue),
+		"exp":      now.Add(ttl).Unix(),
+		"iat":      now.Unix(),
+		"jti":      hex.EncodeToString(nonce[:]),
+		"typ":      gameProviderTokenType,
+		"user_id":  strconv.FormatInt(userID, 10),
+	})
+	signed, err := token.SignedString(v.secret)
+	if err != nil {
+		return "", fmt.Errorf("sign game provider token: %w", err)
+	}
+	return signed, nil
+}
+
 func claimUnixSecondsMS(value any) int64 {
 	switch typed := value.(type) {
 	case float64:
diff --git a/services/gateway-service/internal/auth/jwt_test.go b/services/gateway-service/internal/auth/jwt_test.go
index d665374a..cd6859cd 100644
--- a/services/gateway-service/internal/auth/jwt_test.go
+++ b/services/gateway-service/internal/auth/jwt_test.go
@@ -90,3 +90,22 @@ func TestVerifierDistinguishesExpiredAccessTokenFromInvalidCredentials(t *testin
 		t.Fatalf("expired token with another invalid time claim must remain generic unauthorized, got %v", err)
 	}
 }
+
+func TestGameProviderTokenIsShortAndCallbackOnly(t *testing.T) {
+	t.Parallel()
+	verifier := NewVerifier("secret")
+	token, err := verifier.IssueGameProviderToken("fami", 399999999999990001, 24*time.Hour)
+	if err != nil {
+		t.Fatalf("IssueGameProviderToken failed: %v", err)
+	}
+	if len(token) > 512 {
+		t.Fatalf("game provider token length=%d, want <=512", len(token))
+	}
+	claims, err := verifier.VerifyGameCallbackToken("Bearer " + token)
+	if err != nil || claims.AppCode != "fami" || claims.UserID != 399999999999990001 {
+		t.Fatalf("callback token claims mismatch: claims=%+v err=%v", claims, err)
+	}
+	if _, err := verifier.Verify("Bearer " + token); err == nil {
+		t.Fatal("game provider token must not authenticate ordinary App APIs")
+	}
+}
diff --git a/services/gateway-service/internal/transport/http/game_handler_test.go b/services/gateway-service/internal/transport/http/game_handler_test.go
index 8e1d0def..b3ffb673 100644
--- a/services/gateway-service/internal/transport/http/game_handler_test.go
+++ b/services/gateway-service/internal/transport/http/game_handler_test.go
@@ -203,6 +203,11 @@ func TestLaunchGameForwardsDisplayUserID(t *testing.T) {
 	if gameClient.lastLaunch.GetGameId() != "demo_rocket_001" || gameClient.lastLaunch.GetDisplayUserId() != "100001" || gameClient.lastLaunch.GetRoomId() != "room-1" || gameClient.lastLaunch.GetAccessToken() != accessToken {
 		t.Fatalf("LaunchGame request mismatch: %+v", gameClient.lastLaunch)
 	}
+	providerToken := gameClient.lastLaunch.GetProviderToken()
+	claims, err := auth.NewVerifier("secret").VerifyGameCallbackToken("Bearer " + providerToken)
+	if err != nil || len(providerToken) > 512 || claims.UserID != 42 || claims.AppCode != "lalu" {
+		t.Fatalf("provider token mismatch: length=%d claims=%+v err=%v", len(providerToken), claims, err)
+	}
 }
 
 func TestDiceMatchRenewsAccessTokenWhenTokenNearExpiry(t *testing.T) {
@@ -574,7 +579,10 @@ func TestZGameFixedCallbackRouteIsRawPublicResponse(t *testing.T) {
 }
 
 func TestAMGFixedCallbackRoutesUseAuthorizationTokenAppAndRawResponse(t *testing.T) {
-	token := signGatewayTokenWithAppCode(t, "secret", 42, "fami")
+	token, err := auth.NewVerifier("secret").IssueGameProviderToken("fami", 42, 24*time.Hour)
+	if err != nil {
+		t.Fatalf("IssueGameProviderToken failed: %v", err)
+	}
 	tests := []struct {
 		name      string
 		method    string
diff --git a/services/gateway-service/internal/transport/http/gameapi/game_handler.go b/services/gateway-service/internal/transport/http/gameapi/game_handler.go
index badf0771..d93d513a 100644
--- a/services/gateway-service/internal/transport/http/gameapi/game_handler.go
+++ b/services/gateway-service/internal/transport/http/gameapi/game_handler.go
@@ -21,6 +21,7 @@ import (
 
 const (
 	diceAccessTokenRenewBefore = 10 * time.Minute
+	gameProviderTokenTTL       = 24 * time.Hour
 	hyappAccessTokenHeader     = "X-Hyapp-Access-Token"
 	hyappTokenTypeHeader       = "X-Hyapp-Token-Type"
 	hyappExpiresInHeader       = "X-Hyapp-Expires-In"
@@ -148,6 +149,13 @@ func (h *Handler) launchGame(writer http.ResponseWriter, request *http.Request)
 		httpkit.WriteRPCError(writer, request, err)
 		return
 	}
+	// 厂商令牌由已经完成 access-token 鉴权的 gateway 签发；它只带回调归因需要的最小 claims，
+	// game-service 会按 adapter 决定是否使用，避免 AMG 因完整 App JWT 超过 512 字节而拒绝启动。
+	providerToken, err := h.jwtVerifier.IssueGameProviderToken(appcode.FromContext(request.Context()), userID, gameProviderTokenTTL)
+	if err != nil {
+		httpkit.WriteError(writer, request, http.StatusInternalServerError, httpkit.CodeInternalError, "internal server error")
+		return
+	}
 	resp, err := h.gameClient.LaunchGame(request.Context(), &gamev1.LaunchGameRequest{
 		Meta:          gameMeta(request),
 		UserId:        userID,
@@ -157,6 +165,7 @@ func (h *Handler) launchGame(writer http.ResponseWriter, request *http.Request)
 		RoomId:        body.RoomID,
 		AccessToken:   bearerAccessToken(request),
 		CountryId:     userResp.GetUser().GetCountryId(),
+		ProviderToken: providerToken,
 	})
 	httpkit.Write(writer, request, gameLaunchDataFromProto(resp), err)
 }
@@ -840,12 +849,12 @@ func (h *Handler) withVerifiedCallbackToken(request *http.Request, raw []byte) (
 		return request, false
 	}
 	for _, token := range jwtCandidates {
-		claims, err := h.jwtVerifier.Verify("Bearer " + token)
+		claims, err := h.jwtVerifier.VerifyGameCallbackToken("Bearer " + token)
 		if err != nil {
 			continue
 		}
-		// 游戏回调是公网入口，callback 自带 app_code/header 都不能作为归因事实；只有 gateway 验过签的 HyApp access token
-		// 才能覆盖 request context，后续 gameMeta 会把 token 内 app_code/user_id 透传到 game-service RequestMeta。
+		// 游戏回调是公网入口，callback 自带 app_code/header 都不能作为归因事实；只有 gateway 验过签的
+		// HyApp access/provider token 才能覆盖 request context，后续 gameMeta 会透传签名内的 app_code/user_id。
 		return request.WithContext(auth.WithClaims(request.Context(), claims)), true
 	}
 	return request, false