diff --git a/src/Orbit.Api/Extensions/HttpContextExtensions.cs b/src/Orbit.Api/Extensions/HttpContextExtensions.cs
index 6f78693a..24cf2be5 100644
--- a/src/Orbit.Api/Extensions/HttpContextExtensions.cs
+++ b/src/Orbit.Api/Extensions/HttpContextExtensions.cs
@@ -67,6 +67,11 @@ public static bool IsReadOnlyCredential(this ClaimsPrincipal user)
                 return countryCode;
         }
 
+        var acceptLanguageCountryCode = NormalizeCountryCodeFromAcceptLanguage(
+            context.Request.Headers.AcceptLanguage.ToString());
+        if (acceptLanguageCountryCode is not null)
+            return acceptLanguageCountryCode;
+
         return null;
     }
 
@@ -96,6 +101,29 @@ public static bool IsReadOnlyCredential(this ClaimsPrincipal user)
             : null;
     }
 
+    private static string? NormalizeCountryCodeFromAcceptLanguage(string? acceptLanguage)
+    {
+        if (string.IsNullOrWhiteSpace(acceptLanguage))
+            return null;
+
+        var languageTags = acceptLanguage.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+
+        foreach (var entry in languageTags)
+        {
+            var languageTag = entry.Split(';', 2, StringSplitOptions.TrimEntries)[0]
+                .Replace('_', '-');
+            var segments = languageTag.Split('-', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+            if (segments.Length < 2)
+                continue;
+
+            var countryCode = NormalizeCountryCode(segments[^1]);
+            if (countryCode is not null)
+                return countryCode;
+        }
+
+        return null;
+    }
+
     private static bool TryNormalizeIpAddress(string? ipAddress, out string? normalizedIpAddress)
     {
         normalizedIpAddress = null;
diff --git a/tests/Orbit.Infrastructure.Tests/Controllers/SubscriptionControllerTests.cs b/tests/Orbit.Infrastructure.Tests/Controllers/SubscriptionControllerTests.cs
index b40f5ec5..6d05d628 100644
--- a/tests/Orbit.Infrastructure.Tests/Controllers/SubscriptionControllerTests.cs
+++ b/tests/Orbit.Infrastructure.Tests/Controllers/SubscriptionControllerTests.cs
@@ -110,6 +110,23 @@ await _mediator.Received(1).Send(
             Arg.Any<CancellationToken>());
     }
 
+    [Fact]
+    public async Task CreateCheckout_UsesAcceptLanguageCountryFallback()
+    {
+        _mediator.Send(Arg.Any<CreateCheckoutCommand>(), Arg.Any<CancellationToken>())
+            .Returns(Result.Success(default(CheckoutResponse)!));
+
+        _controller.HttpContext.Request.Headers["Accept-Language"] = "pt-BR,pt;q=0.9,en;q=0.8";
+
+        var request = new SubscriptionController.CreateCheckoutRequest("month");
+
+        await _controller.CreateCheckout(request, CancellationToken.None);
+
+        await _mediator.Received(1).Send(
+            Arg.Is<CreateCheckoutCommand>(c => c.CountryCode == "BR" && c.IpAddress == "127.0.0.1"),
+            Arg.Any<CancellationToken>());
+    }
+
     // --- CreatePortal ---
 
     [Fact]
@@ -241,6 +258,23 @@ await _mediator.Received(1).Send(
             Arg.Any<CancellationToken>());
     }
 
+    [Fact]
+    public async Task GetPlans_UsesAcceptLanguageCountryFallback()
+    {
+        _mediator.Send(Arg.Any<GetPlansQuery>(), Arg.Any<CancellationToken>())
+            .Returns(Result.Success(default(PlansResponse)!));
+
+        _controller.HttpContext.Request.Headers["Accept-Language"] = "pt-BR,pt;q=0.9,en;q=0.8";
+
+        await _controller.GetPlans(CancellationToken.None);
+
+        await _mediator.Received(1).Send(
+            Arg.Is<GetPlansQuery>(query =>
+                query.CountryCode == "BR" &&
+                query.IpAddress == "127.0.0.1"),
+            Arg.Any<CancellationToken>());
+    }
+
     // --- ClaimAdReward ---
 
     [Fact]