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Even though I have zero subtotal payment enabled it will not show up when one page checkout is enabled. If I disable one page checkout then zero subtotal payment is then shown as an option.

Can anyone suggest any reasons for this?

  • may the class Mage_Payment_Model_Method_Free rewrite by any 3rd partly module.. that may be create issue.So ,please chgeck – Amit Bera Jun 30 '15 at 16:35
  • I did a search on the whole project and the only class is in \httpdocs\app\code\core\Mage\Payment\Model\Method\Free.php – Goose84 Jun 30 '15 at 16:37
  • Did you check if (whyever on earth) the Zero Subtotal Payment method is supported by your onepage checkout? Maybe ask the extension provider? – Anna Völkl Jun 30 '15 at 20:09
1

I have figured out the answer myself. I had currency manager installed and had decimal precision set to 6 decimal places. This caused the grand total to actually be (float) 1.0e-6 which caused core magento to error.

If I drop the precision to 4 decimal places then all works well

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