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Generate a Hash of the Token Header

Generate a Base64-encoded SHA-256 hash of these header fields:

Token Headers
Token Header Field	Description
kid	The ID of the key used to digitally sign the JWT.
alg	Algorithm used to sign the token header.
v-c-merchant-id	Merchant ID used in the request transaction.

Follow these steps to generate the hash:

Generate the SHA-256 hash of the fields in JSON format.

Encode the hashed string to Base64.

Create a Message Hash Using the

shasum

Command Line Tool

echo -n "{"kid":"cc34c0a0-bd5a-4a3c-a50d-a2a7db7643df",
"alg":"RS256","v-c-merchant-id":"merchant_id"}"
| shasum -a 256

Create a Message Hash Using the

base64

Command Line Tool

echo -n "a9953cdca19433ae5ec1c4eb0dafd41df6de4d20cd47cbace3c316a1ac6d2008" | base64

Example: Token Header Hash

NTc3N2RlOTAyZWEwNWU0NWM2YTBkNTI4Mjg0YTJmOTVlZGYxYWJlMzBjNzk5OTg1YzEzMjNiMDkzMzc0MWEwNA==