Fix Amazon Checkout on my website that was just transferred to a new hosting service

Avg Bid (USD)
Project Budget (USD)
$10 - $30

Project Description:
I recently transferred my website to a new hosting company and everything else seems to work well (including the paypay checkout), except the Amazon Checkout does not seem to be working. I get the following error during the last step of the Amazon Checkout:

Invalid pattern for IopnMerchantURL.

All I need is for the Amazon Checkout to be fixed. Hopefully, this is relatively simple.

Skills required:
eCommerce, HTML, PHP, Shopping Carts, Website Design
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