diff --git a/lib/main.js b/lib/main.js
index 872f375..36e3b97 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -46,6 +46,8 @@ var ERROR_MESSAGES = {
   50600: 'Duplicate transaction.'
 };
 
+const api_version = '/v2.1'
+
 function get_error_message_from_response(response) {
   var response_code = response.data && response.data.response_code;
   var error_message = 'Undefined Error. This should not happen!';
@@ -139,7 +141,7 @@ module.exports = function (api_key) {
     var request_options = {
        host: 'api.paymill.de',
        port: '443',
-       path: path,
+       path: api_version + path,
        method: method,
        headers: {
          'Authorization': auth,
@@ -176,177 +178,177 @@ module.exports = function (api_key) {
   return {
     payments: {
       create: function(payment, cb) {
-        post('/v2/payments', payment, cb);
+        post('/payments', payment, cb);
       },
       details: function(payment_id, cb) {
         if (typeof payment_id !== 'string') {
           throw new TypeError('payment_id must be a string');
         }
-        get('/v2/payments/' + payment_id, {}, cb);
+        get('/payments/' + payment_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/payments', data, cb);
+        get('/payments', data, cb);
       },
       remove: function(payment_id, cb) {
         if (typeof payment_id !== 'string') {
           throw new TypeError('payment_id must be a string');
         }
-        del('/v2/payments/' + payment_id, {}, cb);
+        del('/payments/' + payment_id, {}, cb);
       }
     },
     preauthorizations: {
       create: function(preauthorization, cb) {
-        post('/v2/preauthorizations', preauthorization, cb);
+        post('/preauthorizations', preauthorization, cb);
       },
       details: function(preauthorization_id, cb) {
         if (typeof preauthorization_id !== 'string') {
           throw new TypeError('preauthorization_id must be a string');
         }
-        get('/v2/preauthorizations/' + preauthorization_id, {}, cb);
+        get('/preauthorizations/' + preauthorization_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/preauthorizations', data, cb);
+        get('/preauthorizations', data, cb);
       },
       remove: function(preauthorization_id, cb) {
         if (typeof preauthorization_id !== 'string') {
           throw new TypeError('preauthorization_id must be a string');
         }
-        del('/v2/preauthorizations/' + preauthorization_id, {}, cb);
+        del('/preauthorizations/' + preauthorization_id, {}, cb);
       }
     },
     transactions: {
       create: function(transaction, cb) {
-        post('/v2/transactions', transaction, cb);
+        post('/transactions', transaction, cb);
       },
       details: function(transaction_id, cb) {
         if (typeof transaction_id !== 'string') {
           throw new TypeError('transaction_id must be a string');
         }
-        get('/v2/transactions/' + transaction_id, {}, cb);
+        get('/transactions/' + transaction_id, {}, cb);
       },
       update: function(transaction_id, data, cb) {
-        put("/v2/transactions/" + transaction_id, data, cb);
+        put("/transactions/" + transaction_id, data, cb);
       },
       list: function(data, cb) {
-        get('/v2/transactions', data, cb);
+        get('/transactions', data, cb);
       }
     },
     refunds: {
       refund: function(transaction_id, amount, description, cb) {
-        post('/v2/refunds/' + transaction_id, {amount: amount, description: description}, cb);
+        post('/refunds/' + transaction_id, {amount: amount, description: description}, cb);
       },
       details: function(refund_id, cb) {
         if (typeof refund_id !== 'string') {
           throw new TypeError('refund_id must be a string');
         }
-        get('/v2/refunds/' + refund_id, {}, cb);
+        get('/refunds/' + refund_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/refunds', data, cb);
+        get('/refunds', data, cb);
       }
     },
     clients: {
       create: function(client, cb) {
-        post('/v2/clients', client, cb);
+        post('/clients', client, cb);
       },
       details: function(client_id, cb) {
         if (typeof client_id !== 'string') {
           throw new TypeError('client_id must be a string');
         }
-        get('/v2/clients/' + client_id, {}, cb);
+        get('/clients/' + client_id, {}, cb);
       },
       update: function(client_id, data, cb) {
         if (typeof client_id !== 'string') {
           throw new TypeError('client_id must be a string');
         }
-        put('/v2/clients/' + client_id, data, cb);
+        put('/clients/' + client_id, data, cb);
       },
       remove: function(client_id, cb) {
         if (typeof client_id !== 'string') {
           throw new TypeError('client_id must be a string');
         }
-        del('/v2/clients/' + client_id, {}, cb);
+        del('/clients/' + client_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/clients', data, cb);
+        get('/clients', data, cb);
       }
     },
     offers: {
       create: function(offer, cb) {
-        post('/v2/offers', offer, cb);
+        post('/offers', offer, cb);
       },
       details: function(offer_id, cb) {
         if (typeof offer_id !== 'string') {
           throw new TypeError('offer_id must be a string');
         }
-        get('/v2/offers/' + offer_id, {}, cb);
+        get('/offers/' + offer_id, {}, cb);
       },
       update: function(offer_id, data, cb) {
         if (typeof offer_id !== 'string') {
           throw new TypeError('offer_id must be a string');
         }
-        put('/v2/offers/' + offer_id, data, cb);
+        put('/offers/' + offer_id, data, cb);
       },
       remove: function(offer_id, cb) {
         if (typeof offer_id !== 'string') {
           throw new TypeError('offer_id must be a string');
         }
-        del('/v2/offers/' + offer_id, {}, cb);
+        del('/offers/' + offer_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/offers', data, cb);
+        get('/offers', data, cb);
       }
     },
     subscriptions: {
       create: function(subscription, cb) {
-        post('/v2/subscriptions', subscription, cb);
+        post('/subscriptions', subscription, cb);
       },
       details: function(subscription_id, cb) {
         if (typeof subscription_id !== 'string') {
           throw new TypeError('subscription_id must be a string');
         }
-        get('/v2/subscriptions/' + subscription_id, {}, cb);
+        get('/subscriptions/' + subscription_id, {}, cb);
       },
       update: function(subscription_id, data, cb) {
         if (typeof subscription_id !== 'string') {
           throw new TypeError('subscription_id must be a string');
         }
-        put('/v2/subscriptions/' + subscription_id, data, cb);
+        put('/subscriptions/' + subscription_id, data, cb);
       },
       remove: function(subscription_id, cb) {
         if (typeof subscription_id !== 'string') {
           throw new TypeError('subscription_id must be a string');
         }
-        del('/v2/subscriptions/' + subscription_id, {}, cb);
+        del('/subscriptions/' + subscription_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/subscriptions', data, cb);
+        get('/subscriptions', data, cb);
       }
     },
     webhooks: {
       create: function(webhook, cb) {
-        post('/v2/webhooks', webhook, cb);
+        post('/webhooks', webhook, cb);
       },
       details: function(webhook_id, cb) {
         if (typeof webhook_id !== 'string') {
           throw new TypeError('webhook_id must be a string');
         }
-        get('/v2/webhooks/' + webhook_id, {}, cb);
+        get('/webhooks/' + webhook_id, {}, cb);
       },
       update: function(webhook_id, data, cb) {
         if (typeof webhook_id !== 'string') {
           throw new TypeError('webhook_id must be a string');
         }
-        put('/v2/webhooks/' + webhook_id, data, cb);
+        put('/webhooks/' + webhook_id, data, cb);
       },
       remove: function(webhook_id, cb) {
         if (typeof webhook_id !== 'string') {
           throw new TypeError('webhook_id must be a string');
         }
-        del('/v2/webhooks/' + webhook_id, {}, cb);
+        del('/webhooks/' + webhook_id, {}, cb);
       },
       list: function(data, cb) {
-        get('/v2/webhooks', data, cb);
+        get('/webhooks', data, cb);
       }
     }
   };