Apple Pay - merchant identity certificate is it required to be on site?

Hi, I have a question about the merchant ID domain verification file. Do we need to store that file on our site permanently, or can we delete it after domain verification? I searched for this information in the documentation, but found nothing specific.

https://developer.apple.com/documentation/applepaywebmerchantregistrationapi/preparing_merchant_domains_for_verification

Apple Pay - merchant identity certificate is it required to be on site?
 
 
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