diff --git a/internal/access/closure_test.go b/internal/access/closure_test.go
index 8585f38c..d963923b 100644
--- a/internal/access/closure_test.go
+++ b/internal/access/closure_test.go
@@ -65,6 +65,29 @@ func TestServiceCloseAssignsSubscriptionsAndProbesGateway(t *testing.T) {
 	}
 }
 
+func TestServiceCloseSubscriptionManagedKeyOverridesExplicitProbeAPIKey(t *testing.T) {
+	host := &fakeClosureHost{
+		gatewayResult: sub2api.GatewayAccessResult{OK: true, StatusCode: 200, HasExpectedModel: true, Models: []string{"deepseek-chat"}},
+		managedAccess: map[string]sub2api.SubscriptionAccessRef{
+			"user-1": {UserID: "host-user-1", APIKey: "managed-user-key"},
+		},
+	}
+	service := NewService(host)
+	_, err := service.Close(context.Background(), ClosureRequest{
+		Mode:          "subscription",
+		ProbeAPIKey:   "caller-supplied-key",
+		GroupID:       "group-1",
+		ExpectedModel: "deepseek-chat",
+		Subscriptions: []SubscriptionTarget{{UserID: "user-1", DurationDays: 30}},
+	})
+	if err != nil {
+		t.Fatalf("Close() error = %v", err)
+	}
+	if host.gatewayProbe.APIKey != "managed-user-key" {
+		t.Fatalf("gateway probe api key = %q, want managed-user-key override", host.gatewayProbe.APIKey)
+	}
+}
+
 func TestServiceCloseReturnsSubscriptionErrorBeforeGatewayProbe(t *testing.T) {
 	host := &fakeClosureHost{assignErr: errors.New("assign failed")}
 	service := NewService(host)
diff --git a/internal/host/sub2api/sub2api_test.go b/internal/host/sub2api/sub2api_test.go
index f2e55ced..d27cd7df 100644
--- a/internal/host/sub2api/sub2api_test.go
+++ b/internal/host/sub2api/sub2api_test.go
@@ -592,10 +592,10 @@ func TestCreateGroupWithMock(t *testing.T) {
 func TestCreateChannelWithMock(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		var req struct {
-			Name               string                       `json:"name"`
-			GroupIDs           []int64                      `json:"group_ids"`
-			ModelMapping       map[string]map[string]string `json:"model_mapping"`
-			ModelPricing       []struct {
+			Name         string                       `json:"name"`
+			GroupIDs     []int64                      `json:"group_ids"`
+			ModelMapping map[string]map[string]string `json:"model_mapping"`
+			ModelPricing []struct {
 				Platform         string   `json:"platform"`
 				Models           []string `json:"models"`
 				BillingMode      string   `json:"billing_mode"`
@@ -607,8 +607,8 @@ func TestCreateChannelWithMock(t *testing.T) {
 				PerRequestPrice  *float64 `json:"per_request_price"`
 				Intervals        []any    `json:"intervals"`
 			} `json:"model_pricing"`
-			RestrictModels     bool                         `json:"restrict_models"`
-			BillingModelSource string                       `json:"billing_model_source"`
+			RestrictModels     bool   `json:"restrict_models"`
+			BillingModelSource string `json:"billing_model_source"`
 		}
 		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 			t.Fatalf("decode request: %v", err)
diff --git a/internal/provision/runtime_import_service_test.go b/internal/provision/runtime_import_service_test.go
index cfe7b82c..9aa8ec0b 100644
--- a/internal/provision/runtime_import_service_test.go
+++ b/internal/provision/runtime_import_service_test.go
@@ -276,6 +276,83 @@ func TestRuntimeImportServiceRepeatedImportReusesManagedResources(t *testing.T)
 	}
 }
 
+func TestRuntimeImportServiceImportReconcilesExistingChannelConfiguration(t *testing.T) {
+	store := openProvisionTestStore(t)
+	defer closeProvisionTestStore(t, store)
+
+	seedProvisionHost(t, store, "host-1", "https://sub2api.example.com")
+
+	host := &fakeHostAdapter{
+		batchAccounts: []sub2api.AccountRef{{ID: "account_1", Name: "minimax-01"}},
+		testResults: map[string]sub2api.ProbeResult{
+			"account_1": {OK: true, Status: "passed"},
+		},
+		models: map[string][]sub2api.AccountModel{
+			"account_1": {{ID: "MiniMax-M2.7-highspeed"}},
+		},
+		gatewayResult: sub2api.GatewayAccessResult{OK: true, StatusCode: 200, HasExpectedModel: true, Models: []string{"MiniMax-M2.5-highspeed", "MiniMax-M2.7-highspeed"}},
+		managedSnapshot: sub2api.ManagedResourceSnapshot{
+			Groups:   []sub2api.NamedResource{{ID: "group_existing", Name: "MiniMax 默认分组-self-service"}},
+			Channels: []sub2api.NamedResource{{ID: "channel_existing", Name: "MiniMax 默认渠道-self-service"}},
+			Plans:    []sub2api.NamedResource{{ID: "plan_existing", Name: "MiniMax 默认套餐-self-service"}},
+		},
+	}
+
+	provider := sampleProviderManifest()
+	provider.ProviderID = "minimax"
+	provider.DisplayName = "MiniMax OpenAI Compatible"
+	provider.BaseURL = "https://v2.aicodee.com/v1"
+	provider.DefaultModels = []string{"MiniMax-M2.5-highspeed", "MiniMax-M2.7-highspeed"}
+	provider.SmokeTestModel = "MiniMax-M2.7-highspeed"
+	provider.GroupTemplate.Name = "MiniMax 默认分组"
+	provider.ChannelTemplate = pack.ChannelTemplate{
+		Name:         "MiniMax 默认渠道",
+		ModelMapping: map[string]string{"MiniMax-M2.5-highspeed": "MiniMax-M2.5-highspeed", "MiniMax-M2.7-highspeed": "MiniMax-M2.7-highspeed"},
+	}
+	provider.PlanTemplate.Name = "MiniMax 默认套餐"
+
+	svc := NewRuntimeImportService(store, host)
+	result, err := svc.Import(context.Background(), RuntimeImportRequest{
+		HostID:      "host-1",
+		HostBaseURL: "https://sub2api.example.com",
+		Pack: pack.LoadedPack{
+			Manifest: pack.Manifest{PackID: "openai-cn-pack", Version: "1.0.0", TargetHost: "sub2api", MinHostVersion: "0.1.126", MaxHostVersion: "0.2.x"},
+			Checksum: "checksum-1",
+		},
+		Provider: provider,
+		Mode:     ImportModePartial,
+		Keys:     []string{"key-1"},
+		Access: AccessRequest{
+			Mode:        AccessModeSelfService,
+			ProbeAPIKey: "user-key",
+		},
+	})
+	if err != nil {
+		t.Fatalf("RuntimeImportService.Import() error = %v", err)
+	}
+	if result.Report.Channel.ID != "channel_existing" {
+		t.Fatalf("Channel.ID = %q, want reused channel_existing", result.Report.Channel.ID)
+	}
+	if host.createChannelCalls != 0 {
+		t.Fatalf("CreateChannel() calls = %d, want 0 when channel already exists", host.createChannelCalls)
+	}
+	if host.updateChannelCalls != 1 {
+		t.Fatalf("UpdateChannel() calls = %d, want 1", host.updateChannelCalls)
+	}
+	if host.updateChannelID != "channel_existing" {
+		t.Fatalf("UpdateChannel() id = %q, want channel_existing", host.updateChannelID)
+	}
+	if len(host.updateChannelReq.ModelPricing) != 1 {
+		t.Fatalf("UpdateChannel().ModelPricing len = %d, want 1", len(host.updateChannelReq.ModelPricing))
+	}
+	if got := host.updateChannelReq.ModelPricing[0].Models; len(got) != 2 || got[0] != "MiniMax-M2.5-highspeed" || got[1] != "MiniMax-M2.7-highspeed" {
+		t.Fatalf("UpdateChannel().ModelPricing[0].Models = %v, want minimax default models", got)
+	}
+	if host.updateChannelReq.ModelPricing[0].BillingMode != "token" {
+		t.Fatalf("UpdateChannel().ModelPricing[0].BillingMode = %q, want token", host.updateChannelReq.ModelPricing[0].BillingMode)
+	}
+}
+
 func openProvisionTestStore(t *testing.T) *sqlite.DB {
 	t.Helper()
 
diff --git a/scripts/import_remote43_provider.sh b/scripts/import_remote43_provider.sh
index 1b2435ba..324f4d80 100755
--- a/scripts/import_remote43_provider.sh
+++ b/scripts/import_remote43_provider.sh
@@ -19,7 +19,7 @@ HOST_NAME="${HOST_NAME:-remote43-current-host}"
 REMOTE_HOST_ENV_FILE="${REMOTE_HOST_ENV_FILE:-/home/ubuntu/sub2api-host-validation-fresh-deepseek-20260519_115244/.env}"
 REMOTE_PG_CONTAINER="${REMOTE_PG_CONTAINER:-sub2api-relaymgr-pg}"
 REMOTE_REDIS_CONTAINER="${REMOTE_REDIS_CONTAINER:-sub2api-relaymgr-redis}"
-PACK_PATH="${PACK_PATH:-/home/ubuntu/sub2api-cn-relay-manager/packs/openai-cn-pack}"
+PACK_PATH="${PACK_PATH:-$ROOT_DIR/packs/openai-cn-pack}"
 ROOT="${ROOT:-$ROOT_DIR/artifacts/real-host-acceptance}"
 ART="${ART:-$ROOT/$(date +%Y%m%d_%H%M%S)_remote43_${provider_id}_key_import}"
 MIN_BALANCE="${MIN_BALANCE:-10}"
@@ -46,6 +46,53 @@ ssh_cmd() {
   ssh -i "$KEY" -o StrictHostKeyChecking=no "$REMOTE" "$cmd"
 }
 
+build_managed_subscription_identity_json() {
+  local selector="$1"
+  local group_id="$2"
+  python3 - "$selector" "$group_id" <<'PY'
+import hashlib, json, sys
+
+selector, group_id = sys.argv[1:3]
+
+def sanitize(value: str) -> str:
+    value = value.strip().lower()
+    chars = []
+    last_dash = False
+    for ch in value:
+        if ('a' <= ch <= 'z') or ('0' <= ch <= '9'):
+            chars.append(ch)
+            last_dash = False
+        elif not last_dash:
+            chars.append('-')
+            last_dash = True
+    return ''.join(chars).strip('-')
+
+def truncate(value: str, max_len: int) -> str:
+    if len(value) <= max_len:
+        return value
+    return value[:max_len].strip('-')
+
+normalized = selector.strip().lower() + '|' + group_id.strip()
+digest = hashlib.sha256(normalized.encode('utf-8')).hexdigest()
+prefix = sanitize(selector) or 'relay-sub'
+prefix = truncate(prefix, 24)
+short_hash = digest[:16]
+key_hash = digest[:32]
+username = truncate(f"{prefix}-{short_hash[:8]}", 32)
+print(json.dumps({
+    'email': f"{prefix}-{short_hash}@sub2api.local",
+    'username': username,
+    'custom_key': 'sk-relay-' + key_hash,
+    'key_name': truncate(username + '-key', 48),
+}, ensure_ascii=False))
+PY
+}
+
+remote_lookup_managed_subscription_user_id() {
+  local email="$1"
+  remote_pg_query "select id from users where email = $(sql_literal "$email") order by id desc limit 1;"
+}
+
 crm_curl_json() {
   local method="$1"
   local path="$2"
@@ -344,6 +391,11 @@ for item in batch_obj.get('managed_resources', []):
 raise SystemExit('missing managed group in import response and batch detail')
 PY
 )"
+managed_identity_json="$(build_managed_subscription_identity_json "$sub_uid" "$subscription_group_id")"
+managed_user_email="$(printf '%s' "$managed_identity_json" | python3 -c 'import json,sys; print(json.load(sys.stdin)["email"])')"
+managed_probe_key="$(printf '%s' "$managed_identity_json" | python3 -c 'import json,sys; print(json.load(sys.stdin)["custom_key"])')"
+managed_user_id="$(remote_lookup_managed_subscription_user_id "$managed_user_email")"
+managed_user_id="${managed_user_id##*$'\n'}"
 auth_cache_key="$(build_api_key_auth_cache_key "$sub_key")"
 balance_cache_key="$(build_user_balance_cache_key "$sub_uid")"
 subscription_cache_key="$(build_subscription_billing_cache_key "$sub_uid" "$subscription_group_id")"
@@ -360,11 +412,15 @@ remote_pg_exec "$prep_sql" > "$ART/06-subscription-access-prep.psql.txt"
   printf 'subscription_cache_key=%s\n' "$subscription_cache_key"
   ssh_cmd "sudo -n docker exec $REMOTE_REDIS_CONTAINER_Q redis-cli DEL $auth_cache_key $balance_cache_key $subscription_cache_key"
 } > "$ART/07-redis-targeted-invalidation.txt"
-remote_fetch_group_state "$subscription_group_id" "$sub_uid" "$sub_key" "$ART/08-subscription-group-state.json"
+if [[ -n "$managed_user_id" ]]; then
+  remote_fetch_group_state "$subscription_group_id" "$managed_user_id" "$managed_probe_key" "$ART/08-subscription-group-state.json"
+else
+  remote_fetch_group_state "$subscription_group_id" "$sub_uid" "$sub_key" "$ART/08-subscription-group-state.json"
+fi
 
-python3 - "$ART/01-runtime-context.json" "$CRM_BASE" "$HOST_BASE" "$CRM_HOST_BASE" "$provider_id" "$sub_uid" "$sub_key" "$subscription_group_id" "$admin_uid" <<'PY'
+python3 - "$ART/01-runtime-context.json" "$CRM_BASE" "$HOST_BASE" "$CRM_HOST_BASE" "$provider_id" "$sub_uid" "$sub_key" "$subscription_group_id" "$admin_uid" "$managed_user_email" "$managed_probe_key" "$managed_user_id" <<'PY'
 import json, sys, pathlib
-path, crm, host, crm_host, provider_id, sub_uid, sub_key, group_id, admin_uid = sys.argv[1:10]
+path, crm, host, crm_host, provider_id, sub_uid, sub_key, group_id, admin_uid, managed_user_email, managed_probe_key, managed_user_id = sys.argv[1:13]
 pathlib.Path(path).write_text(json.dumps({
   'crm_base': crm,
   'host_base': host,
@@ -374,6 +430,9 @@ pathlib.Path(path).write_text(json.dumps({
   'subscription_user_key_prefix': sub_key[:12],
   'subscription_group_id': group_id,
   'admin_user_id': admin_uid,
+  'managed_user_email': managed_user_email,
+  'managed_user_id': managed_user_id,
+  'managed_probe_key_prefix': managed_probe_key[:18],
 }, ensure_ascii=False, indent=2), encoding='utf-8')
 PY
 
@@ -387,11 +446,11 @@ print(json.dumps({
 }, ensure_ascii=False))
 PY
 )"
-ssh_cmd "curl -sS -D /tmp/models_headers.txt -o /tmp/models_body.json -H 'Authorization: Bearer $sub_key' $HOST_BASE/v1/models"
+ssh_cmd "curl -sS -D /tmp/models_headers.txt -o /tmp/models_body.json -H 'Authorization: Bearer $managed_probe_key' $HOST_BASE/v1/models"
 ssh_cmd "cat /tmp/models_headers.txt" > "$ART/09-models.headers.txt"
 ssh_cmd "cat /tmp/models_body.json" > "$ART/10-models.body.json"
 
-ssh_cmd "curl -sS -D /tmp/chat_headers.txt -o /tmp/chat_body.json -H 'Authorization: Bearer $sub_key' -H 'Content-Type: application/json' $HOST_BASE/v1/chat/completions -d $(printf %q "$probe_payload")"
+ssh_cmd "curl -sS -D /tmp/chat_headers.txt -o /tmp/chat_body.json -H 'Authorization: Bearer $managed_probe_key' -H 'Content-Type: application/json' $HOST_BASE/v1/chat/completions -d $(printf %q "$probe_payload")"
 ssh_cmd "cat /tmp/chat_headers.txt" > "$ART/11-chat.headers.txt"
 ssh_cmd "cat /tmp/chat_body.json" > "$ART/12-chat.body.json"