diff --git a/src/axios-api-versioning-interceptor.ts b/src/axios-api-versioning-interceptor.ts
index d85d678..6bba650 100644
--- a/src/axios-api-versioning-interceptor.ts
+++ b/src/axios-api-versioning-interceptor.ts
@@ -1,50 +1,50 @@
 import { AxiosRequestConfig } from 'axios';
-import { AxiosWithVersioning, VersioningStrategy } from './types'
+import { AxiosWithVersioning, VersioningStrategy, IVersioningConfig } from './types'
 
 function replaceUrlPathWithVersion(url: string, apiVersion: string) {
     // the template name of the api version must be "apiVersion"
     return url.replace('{apiVersion}', apiVersion);
 }
 
-function enhanceConfigByVersioningStrategy(instance: AxiosWithVersioning, config: AxiosRequestConfig): AxiosRequestConfig {
-    if (instance.defaults.hasOwnProperty('apiVersion') === false && config['apiVersion'] === undefined) {
-        return config;
+function enhanceConfigByVersioningStrategy(instance: AxiosWithVersioning, requestConfig: AxiosRequestConfig, versioningConfig: IVersioningConfig): AxiosRequestConfig {
+    if (instance.defaults.hasOwnProperty('apiVersion') === false && requestConfig['apiVersion'] === undefined) {
+        return requestConfig;
     }
 
     // we prioritize the apiVersion passed via the RequestConfig first
     // then use the global default apiVersion last
-    const apiVersion = config['apiVersion'] || instance.defaults['apiVersion'];
+    const apiVersion = requestConfig['apiVersion'] || instance.defaults['apiVersion'];
 
     // same way here, we prioritize the RequestConfig first then the global defaults
-    const versioningStrategy = config['versioningStrategy'] || instance.defaults['versioningStrategy'];
+    const versioningStrategy = requestConfig['versioningStrategy'] || instance.defaults['versioningStrategy'];
 
     if (versioningStrategy === VersioningStrategy.QueryString) {
-        config.params = {
-            ...config.params,
-            'api-version': apiVersion
+        requestConfig.params = {
+            ...requestConfig.params,
+            [versioningConfig.queryStringKeyName]: apiVersion
         };
     }
 
     if (versioningStrategy === VersioningStrategy.MediaType) {
-        const defaultAcceptHeader = config.headers.common["Accept"] || '';
+        const defaultAcceptHeader = requestConfig.headers.common["Accept"] || '';
 
-        config.headers = {
-            ...config.headers,
-            ["Accept"]: defaultAcceptHeader + `;v=${apiVersion}`
+        requestConfig.headers = {
+            ...requestConfig.headers,
+            ["Accept"]: defaultAcceptHeader + `;${versioningConfig.mediaTypeKeyName}=${apiVersion}`
         }
     }
 
     if (versioningStrategy === VersioningStrategy.UrlPath) {
-        config.url = replaceUrlPathWithVersion(config.url!, apiVersion);
+        requestConfig.url = replaceUrlPathWithVersion(requestConfig.url!, apiVersion);
     }
 
-    return config;
+    return requestConfig;
 }
 
-export function injectApiVersioningInterceptor(instance: AxiosWithVersioning) {
+export function injectApiVersioningInterceptor(instance: AxiosWithVersioning, versioningConfig: IVersioningConfig) {
     // add an interceptor
-    instance.interceptors.request.use(config => {
-        const enhancedConfig = enhanceConfigByVersioningStrategy(instance, config);
+    instance.interceptors.request.use((requestConfig) => {
+        const enhancedConfig = enhanceConfigByVersioningStrategy(instance, requestConfig, versioningConfig);
         return enhancedConfig;
     });
 }
diff --git a/src/axios-api-versioning.ts b/src/axios-api-versioning.ts
index 60f219c..9eeb8ca 100644
--- a/src/axios-api-versioning.ts
+++ b/src/axios-api-versioning.ts
@@ -1,19 +1,22 @@
 import axios, { AxiosInstance, AxiosStatic } from 'axios';
-import { AxiosWithVersioning, IWithVersioningConfig } from './types'
+import { AxiosWithVersioning, IWithVersioningConfig, IVersioningConfig } from './types'
 import { injectApiVersioningInterceptor } from './axios-api-versioning-interceptor'
 import { defaultWithVersioningConfig } from './defaultConfig';
 
-export function withVersioning(instance: AxiosInstance | AxiosStatic, config: IWithVersioningConfig = defaultWithVersioningConfig) {
+export function withVersioning(instance: AxiosInstance | AxiosStatic, config?: IWithVersioningConfig) {
+    // merge default config options
+    const versioningConfig: IWithVersioningConfig = { ...defaultWithVersioningConfig, ...config };
+
     // deep clone the instance so we don't affect it in any way
     let clonedInstance = axios.create(instance.defaults);
 
     // set up for modifying the instance.defaults object
     let value: any = {
-        versioningStrategy: config.versioningStrategy
+        versioningStrategy: versioningConfig.versioningStrategy
     };
 
-    if (config.apiVersion) {
-        value['apiVersion'] = config.apiVersion;
+    if (versioningConfig.apiVersion) {
+        value['apiVersion'] = versioningConfig.apiVersion;
     }
 
     value = {
@@ -28,7 +31,7 @@ export function withVersioning(instance: AxiosInstance | AxiosStatic, config: IW
     })
 
     // add required api versioning interceptor
-    injectApiVersioningInterceptor(clonedInstance as AxiosWithVersioning);
+    injectApiVersioningInterceptor(clonedInstance as AxiosWithVersioning, versioningConfig as IVersioningConfig);
 
     return clonedInstance as AxiosWithVersioning;
 }
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