There was a bug with the IPN that got fixed around April 16, but I don't know if it got fixed on trunk only or in SaaS3 as well. If you are on the SaaS, are you sure you are still in SaaS3? I'd recommend to create a new SaaS database just to test if it works with the latest version (SaaS4 at this time). If it does, send an email to online@openerp.com to request to be migrated to SaaS4.

I had the same problem as Erwin and have just asked Odoo saas online support to upgrade my saas instance from saas3 to saas5 (I had assumed that this would be done automatically). The Seller ID that Odoo refers to is what paypal refers to as 'Secure Merchant Account ID' - it is 13 alphanumeric characters in my test account.

@DIDER LACOMBE

Please see this Github issue for more information and potential temporary patches: https://github.com/odoo/odoo/issues/768#issuecomment-215951673

Hello

I have the same problem with ODOO V9C Community

error https://xxxx.my.openerp.com/payment/paypal/dpn/ METHOD NOT ALLOWED

Any pogress on that ?

thanks

Best regards