diff --git a/test/src/unit-capi-config.cc b/test/src/unit-capi-config.cc
index 5f8abc0260d..b7835cb4e02 100644
--- a/test/src/unit-capi-config.cc
+++ b/test/src/unit-capi-config.cc
@@ -615,6 +615,7 @@ TEST_CASE("C API: Test config iter", "[capi][config]") {
   all_param_values["rest.load_enumerations_on_array_open"] = "false";
   all_param_values["rest.use_refactored_array_open"] = "true";
   all_param_values["rest.use_refactored_array_open_and_query_submit"] = "true";
+  all_param_values["rest.payer_namespace"] = "";
   all_param_values["sm.allow_separate_attribute_writes"] = "false";
   all_param_values["sm.allow_updates_experimental"] = "false";
   all_param_values["sm.encryption_key"] = "";
diff --git a/test/src/unit-curl.cc b/test/src/unit-curl.cc
index 7f40e8b31ec..e3e79017bc7 100644
--- a/test/src/unit-curl.cc
+++ b/test/src/unit-curl.cc
@@ -138,9 +138,19 @@ TEST_CASE(
 
   ContextResources resources(
       cfg, tiledb::test::g_helper_logger(), 1, 1, "test");
-  // We copy because the [] operator is not const-qualified.
-  auto extra_headers = resources.rest_client()->extra_headers();
-  CHECK(extra_headers.size() == 2);
-  CHECK(extra_headers["abc"] == "def");
-  CHECK(extra_headers["ghi"] == "jkl");
+  const auto& extra_headers = resources.rest_client()->extra_headers();
+  CHECK(extra_headers.at("abc") == "def");
+  CHECK(extra_headers.at("ghi") == "jkl");
+}
+
+TEST_CASE(
+    "RestClient: Ensure payer namespace is set",
+    "[rest-client][payer-namespace]") {
+  tiledb::sm::Config cfg;
+  REQUIRE(cfg.set("rest.payer_namespace", "foo").ok());
+
+  ContextResources resources(
+      cfg, tiledb::test::g_helper_logger(), 1, 1, "test");
+  const auto& extra_headers = resources.rest_client()->extra_headers();
+  CHECK(extra_headers.at("X-Payer") == "foo");
 }
diff --git a/tiledb/api/c_api/config/config_api_external.h b/tiledb/api/c_api/config/config_api_external.h
index 19d96f180ff..8cb17bdf53e 100644
--- a/tiledb/api/c_api/config/config_api_external.h
+++ b/tiledb/api/c_api/config/config_api_external.h
@@ -713,6 +713,9 @@ TILEDB_EXPORT void tiledb_config_free(tiledb_config_t** config) TILEDB_NOEXCEPT;
  *    (Optional) Prefix for custom headers on REST requests. For each custom
  *    header, use "rest.custom_headers.header_key" = "header_value" <br>
  *    **Optional. No Default**
+ * - `rest.payer_namespace` <br>
+ *    The namespace that should be charged for the request. <br>
+ *    **Default**: no default set
  * - `filestore.buffer_size` <br>
  *    Specifies the size in bytes of the internal buffers used in the filestore
  *    API. The size should be bigger than the minimum tile size filestore
diff --git a/tiledb/sm/config/config.cc b/tiledb/sm/config/config.cc
index 4a5e677295c..325140d2125 100644
--- a/tiledb/sm/config/config.cc
+++ b/tiledb/sm/config/config.cc
@@ -96,6 +96,7 @@ const std::string Config::REST_LOAD_METADATA_ON_ARRAY_OPEN = "true";
 const std::string Config::REST_LOAD_NON_EMPTY_DOMAIN_ON_ARRAY_OPEN = "true";
 const std::string Config::REST_USE_REFACTORED_ARRAY_OPEN = "false";
 const std::string Config::REST_USE_REFACTORED_QUERY_SUBMIT = "false";
+const std::string Config::REST_PAYER_NAMESPACE = "";
 const std::string Config::SM_ALLOW_SEPARATE_ATTRIBUTE_WRITES = "false";
 const std::string Config::SM_ALLOW_UPDATES_EXPERIMENTAL = "false";
 const std::string Config::SM_ENCRYPTION_KEY = "";
@@ -270,6 +271,7 @@ const std::map<std::string, std::string> default_config_values = {
     std::make_pair(
         "rest.use_refactored_array_open_and_query_submit",
         Config::REST_USE_REFACTORED_QUERY_SUBMIT),
+    std::make_pair("rest.payer_namespace", Config::REST_PAYER_NAMESPACE),
     std::make_pair(
         "config.env_var_prefix", Config::CONFIG_ENVIRONMENT_VARIABLE_PREFIX),
     std::make_pair("config.logging_level", Config::CONFIG_LOGGING_LEVEL),
diff --git a/tiledb/sm/config/config.h b/tiledb/sm/config/config.h
index 3dd6fa760f1..0ed2e5e050d 100644
--- a/tiledb/sm/config/config.h
+++ b/tiledb/sm/config/config.h
@@ -125,6 +125,9 @@ class Config {
   /** Refactored query submit is disabled by default */
   static const std::string REST_USE_REFACTORED_QUERY_SUBMIT;
 
+  /** The namespace that should be charged for the request. */
+  static const std::string REST_PAYER_NAMESPACE;
+
   /** The prefix to use for checking for parameter environmental variables. */
   static const std::string CONFIG_ENVIRONMENT_VARIABLE_PREFIX;
 
diff --git a/tiledb/sm/cpp_api/config.h b/tiledb/sm/cpp_api/config.h
index e7460807078..e447683267b 100644
--- a/tiledb/sm/cpp_api/config.h
+++ b/tiledb/sm/cpp_api/config.h
@@ -893,6 +893,9 @@ class Config {
    *    (Optional) Prefix for custom headers on REST requests. For each custom
    *    header, use "rest.custom_headers.header_key" = "header_value" <br>
    *    **Optional. No Default**
+   * - `rest.payer_namespace` <br>
+   *    The namespace that should be charged for the request. <br>
+   *    **Default**: no default set
    * - `filestore.buffer_size` <br>
    *    Specifies the size in bytes of the internal buffers used in the
    *    filestore API. The size should be bigger than the minimum tile size
diff --git a/tiledb/sm/rest/rest_client.cc b/tiledb/sm/rest/rest_client.cc
index ae7575317e5..b7408fd6ffd 100644
--- a/tiledb/sm/rest/rest_client.cc
+++ b/tiledb/sm/rest/rest_client.cc
@@ -151,6 +151,12 @@ Status RestClient::init(
 
   load_headers(*config_);
 
+  if (auto payer =
+          config_->get<std::string>("rest.payer_namespace", Config::must_find);
+      !payer.empty()) {
+    extra_headers_["X-Payer"] = std::move(payer);
+  }
+
   return Status::Ok();
 }
 
diff --git a/tiledb/sm/rest/rest_client.h b/tiledb/sm/rest/rest_client.h
index d572cff96c3..84b2535a820 100644
--- a/tiledb/sm/rest/rest_client.h
+++ b/tiledb/sm/rest/rest_client.h
@@ -574,7 +574,7 @@ class RestClient {
    */
   Status ensure_json_null_delimited_string(Buffer* buffer);
 
-  /** Load all custom headers from the given config.  */
+  /** Load all custom headers from the given config. */
   void load_headers(const Config& cfg);
 };