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To successfully import your tokens, please encrypt the import file using the PGP public key and send it to the provided GCP signed URL.

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Encryption

Merchants must encrypt the token file before sending it. A suggested approach to encryption is using GnuPG interface that can be used to encrypt files using PGP public keys. Please refer to the GnuPG documentation to learn how to add the public key to your keyring and how to encrypt your token file with the key.

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File transfer

When you request a token import, a Google Cloud Storage signed URL is provided. This allows you to upload files directly via HTTPS. Sending to this Google Cloud Storage signed URL can be accomplished in a variety of ways described in this Google Cloud storage guide. For example, using cURL this request would look something like this. 
curl -X PUT -H 'Content-Type: text/plain' --upload-file tokens.csv.gpg google_signed_cloud_storage_url
In this example, google_signed_cloud_storage_url is the URL provided, and tokens.csv.gpg is the name of the encrypted token file.