I am using postgresql and startTransaction() etc has been renamed transactionStart() etc on trunk for consistency purposes. I have fixed and have a diff patch for the payment module. I can't seem to upload it as an attachment here. Does anyone want it? inline.....

Index: code/DPSPayment/DPSAdapter.php
===================================================================
--- code/DPSPayment/DPSAdapter.php   (revision 115626)
+++ code/DPSPayment/DPSAdapter.php   (working copy)
@@ -576,7 +576,7 @@
    $xml = new SimpleXMLElement($request_string);
    $urls = $xml->xpath('//URI');
    $url = $urls[0].'';
-         DB::getConn()->endTransaction();
+         DB::getConn()->transactionEnd();
         if(self::$mode == "Unit_Test_Only"){
            return $url;
         }else{
@@ -617,7 +617,7 @@
         }
      
         if($payment) {
-            DB::getConn()->startTransaction();
+            DB::getConn()->transactionStart();
            try{
               $payment->ResponseXML = $rsp->toXml();
               $success = $rsp->getSuccess();
@@ -631,7 +631,7 @@
               }
               $payment->Message=$rsp->getResponseText();
               $payment->write();
-               DB::getConn()->endTransaction();
+               DB::getConn()->transactionEnd();
            }catch(Exception $e){
               DB::getConn()->transactionRollback();
               $payment->handleError($e);
Index: code/DPSPayment/DPSPayment.php
===================================================================
--- code/DPSPayment/DPSPayment.php   (revision 115626)
+++ code/DPSPayment/DPSPayment.php   (working copy)
@@ -143,7 +143,7 @@
         $adapter = new DPSAdapter();
         $inputs = $this->prepareAuthInputs($data);
         $adapter->doPayment($inputs, $this);
-         DB::getConn()->endTransaction();
+         DB::getConn()->transactionEnd();
      }catch(Exception $e){
         DB::getConn()->transactionRollback();
         $this->handleError($e);
@@ -168,7 +168,7 @@
   }
   
   function complete(){
-      DB::getConn()->startTransaction();
+      DB::getConn()->transactionStart();
      try{
         $auth = $this->AuthPayment();
         $this->TxnType = "Complete";
@@ -178,7 +178,7 @@
         $adapter = new DPSAdapter();
         $inputs = $this->prepareCompleteInputs();
         $adapter->doPayment($inputs, $this);
-         DB::getConn()->endTransaction();
+         DB::getConn()->transactionEnd();
      }catch(Exception $e){
         DB::getConn()->transactionRollback();
         $this->handleError($e);
@@ -241,7 +241,7 @@
   }
   
   function dpshostedPurchase($data){
-      DB::getConn()->startTransaction();
+      DB::getConn()->transactionStart();
      try{
         $this->TxnType = "Purchase";
         $this->write();
Index: code/DPSPayment/DPSRecurringPayment.php
===================================================================
--- code/DPSPayment/DPSRecurringPayment.php   (revision 115626)
+++ code/DPSPayment/DPSRecurringPayment.php   (working copy)
@@ -77,7 +77,7 @@
   }
   
   function recurringAuth($data){
-      DB::getConn()->startTransaction();
+      DB::getConn()->transactionStart();
      try{
         $this->TxnType = "Auth";
         $this->AuthAmount = 1.00;
@@ -114,7 +114,7 @@
   }
   
   function merchantRecurringAuth($data){
-      DB::getConn()->startTransaction();
+      DB::getConn()->transactionStart();
      try{
         $this->AuthAmount = 1.00;
         $this->write();
@@ -122,7 +122,7 @@
         $adapter = new DPSAdapter();
         $inputs = $this->prepareMerchantHostedRecurringAuthInputs($data);
         $adapter->doPayment($inputs, $this);
-         DB::getConn()->endTransaction();
+         DB::getConn()->transactionEnd();
      }catch(Exception $e){
         DB::getConn()->transactionRollback();
         $this->handleError($e);

Hi Will,

I kind of thought that would be the case, but with all the migration stuff happening I just wasn't sure what to do. Things do seem a bit chaotic at the moment and when fixes go in one place and then don't get rolled into dependent modules (in a different VCS) it doesn't help!

I'll wait until payment gets migrated to git.

Tony, so glad you posted this here, I have just downloaded the payment module and the latest silverstripe and was getting the error:

Fatal error: Call to undefined method MySQLDatabase::transactionStart() in C:\xampp\htdocs\hireme\payment\code\DPSPayment\DPSPayment.php on line 244

Wasn't sure what was going on. but all you have to do is change transactionStart to startTransaction

Its hard to know whats going on with SS sometimes....