diff --git a/.release_info.md b/.release_info.md
index da1acba..0dc03b1 100644
--- a/.release_info.md
+++ b/.release_info.md
@@ -1,5 +1,3 @@
 ## Fixed
-- Do not attempt to send data if `read_data` is not set
-
-## Misc
-- Adjust checks for when data should be sent in `update|read|destroy_data` operations to be more deterministic
+- Thanks to a proposal in #202 by @harshavmb, the long broken `endpoint_params` in `oauth_client_credentials` is working!
+- Fix incorrect state after failed updates when errors are detected. Thanks for the report #152, @jollyroger and the PR #265, @ugur-zongur!
\ No newline at end of file
diff --git a/docs/index.md b/docs/index.md
index 38b1857..5a69665 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -50,7 +50,7 @@ provider "restapi" {
 - `insecure` (Boolean) When using https, this disables TLS verification of the host.
 - `key_file` (String) When set with the cert_file parameter, the provider will load a client certificate as a file for mTLS authentication. Note that this mechanism simply delegates to golang's tls.LoadX509KeyPair which does not support passphrase protected private keys. The most robust security protections available to the key_file are simple file system permissions.
 - `key_string` (String) When set with the cert_string parameter, the provider will load a client certificate as a string for mTLS authentication. Note that this mechanism simply delegates to golang's tls.LoadX509KeyPair which does not support passphrase protected private keys. The most robust security protections available to the key_file are simple file system permissions.
-- `oauth_client_credentials` (Block List, Max: 1) Configuration for oauth client credential flow (see [below for nested schema](#nestedblock--oauth_client_credentials))
+- `oauth_client_credentials` (Block List, Max: 1) Configuration for oauth client credential flow using the https://pkg.go.dev/golang.org/x/oauth2 implementation (see [below for nested schema](#nestedblock--oauth_client_credentials))
 - `password` (String) When set, will use this password for BASIC auth to the API.
 - `rate_limit` (Number) Set this to limit the number of requests per second made to the API.
 - `read_method` (String) Defaults to `GET`. The HTTP method used to READ objects of this type on the API server.
@@ -73,5 +73,5 @@ Required:
 
 Optional:
 
-- `endpoint_params` (Map of List of String) Additional key/values to pass to the underlying Oauth client library (as EndpointParams)
+- `endpoint_params` (Map of String) Additional key/values to pass to the underlying Oauth client library (as EndpointParams)
 - `oauth_scopes` (List of String) scopes
diff --git a/examples/workingexamples/provider_with_oauth.tf b/examples/workingexamples/provider_with_oauth.tf
index ebcd90e..494810c 100644
--- a/examples/workingexamples/provider_with_oauth.tf
+++ b/examples/workingexamples/provider_with_oauth.tf
@@ -5,9 +5,12 @@ provider "restapi" {
   write_returns_object = true
 
   oauth_client_credentials {
-      oauth_client_id = "example"
-      oauth_client_secret = "example"
-      oauth_token_endpoint = "https://example.com/tokenendpoint"
-      oauth_scopes = ["openid"]
+    oauth_client_id = "example"
+    oauth_client_secret = "example"
+    oauth_token_endpoint = "https://example.com/tokenendpoint"
+    oauth_scopes = ["openid"]
+    endpoint_params = {
+      audience = "myCoolAPI"
+    }
   }
-}
+}
\ No newline at end of file
diff --git a/restapi/provider.go b/restapi/provider.go
index 6dab97a..20a4dbd 100644
--- a/restapi/provider.go
+++ b/restapi/provider.go
@@ -132,7 +132,7 @@ func Provider() *schema.Provider {
 				Type:        schema.TypeList,
 				Optional:    true,
 				MaxItems:    1,
-				Description: "Configuration for oauth client credential flow",
+				Description: "Configuration for oauth client credential flow using the https://pkg.go.dev/golang.org/x/oauth2 implementation",
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"oauth_client_id": {
@@ -161,8 +161,7 @@ func Provider() *schema.Provider {
 							Optional:    true,
 							Description: "Additional key/values to pass to the underlying Oauth client library (as EndpointParams)",
 							Elem: &schema.Schema{
-								Type: schema.TypeList,
-								Elem: &schema.Schema{Type: schema.TypeString},
+								Type: schema.TypeString,
 							},
 						},
 					},
@@ -264,10 +263,8 @@ func configureProvider(d *schema.ResourceData) (interface{}, error) {
 		if tmp, ok := oauthConfig["endpoint_params"]; ok {
 			m := tmp.(map[string]interface{})
 			setVals := url.Values{}
-			for k, vals := range m {
-				for _, val := range vals.([]string) {
-					setVals.Add(k, val)
-				}
+			for k, val := range m {
+				setVals.Add(k, val.(string))
 			}
 			opt.oauthEndpointParams = setVals
 		}
diff --git a/restapi/provider_test.go b/restapi/provider_test.go
index febace7..700f2ee 100644
--- a/restapi/provider_test.go
+++ b/restapi/provider_test.go
@@ -51,16 +51,9 @@ func TestResourceProvider_Oauth(t *testing.T) {
 		"uri": "http://foo.bar/baz",
 		"oauth_client_credentials": map[string]interface{}{
 			"oauth_client_id": "test",
-			/*
-				Commented out 2022-06-27. Although terraform allows the provider to define this as
-				array of strings, it panics during unmarshal on the terraform provider SDK
-						"oauth_client_credentials": map[string]interface{}{
-							"test": []string{
-								"value1",
-								"value2",
-							},
-						},
-			*/
+			"oauth_client_credentials": map[string]interface{}{
+				"audience": "coolAPI",
+			},
 		},
 	}