mpbm23

What is your problem exactly?

Probably an error with your username, password, merchantid, posid or acquirerid.
Check that you entered the credentials correctly

Go to Test case 8 in the Redirection Manual
create an order, pay with piraeus and in the redirect use the Card number and expiration date you see in the manual.
Every month returns different outcome.

When the bank gives you the test account credentials you perform the test cases and if everything is successful you then request live credentials.

What about them?

I found the problem. After the last update the plugin was not uploaded properly to WordPress Repository. I will ask the author to reupload it.

you can replace

add_action( 'woocommerce_init' , array( &$this , 'add_payment_options'), 99 );

with

add_action( 'wp_loaded' , array( &$this , 'add_payment_options'), 99 );

in admin/class-pay4pay-admin.php
as seen here
https://github.com/mcguffin/woocommerce-payforpayment/blob/master/admin/class-pay4pay-admin.php

I found the problem. After the last update the plugin was not uploaded properly to WordPress Repository. I will ask the author to reupload it.

Can you tell me when the plugin loads in order to use a later loading time?

What version of pay for payment do you have?

I updated the translations to the latest from Transifex and everything works fine. Gunu thanks for helping, it did not cross my mind that the translations were not complete.

The funny thing is that in Transifex where the translations are made for woocommerce these strings have been translated.

I think I found it. The greek translation did not have “First Name” it only has “First name”

only english.

Yes First Name, Last Name , e-mail are translated.

It is el_GR as all of my .mo and .po files.