1. I registered the API and key configured in the script store.
But when paying for goods message appears: All API \ 's are unavailable
What could be the reason?
I think that may be because the blockchain.info and blockexplorer.com API's block connections from hidden services. But you shouldn't see that message at all if you're trying to use the coinbase API. You need to go into your SCI settings and set "Use coinbase API" to true. Make sure you read the coinbase.txt file in the install folder.
I made all the settings as a file coinbase.txt