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Generate the Token Header

The token header is encrypted with a URL safe base64 algorithm. These three header fields must be included in the header.

Token Header Fields
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. To obtain the merchant ID, see Step 1: Sign Up for a Sandbox Account.

Token Header

eyJ2LWMtbWVyY2hhbnQtaWQiOiJtZXJjaGFudElEIiwiYWxnIjoiUlMyNTYiLCJraWQiOiI3MDc4NjMzMjg1MjUwMTc3MDQxNDk5In0

Generating the Token Header with Python

Encode the header data and then remove any padding added during the encryption process.

import base64

# open file in binary mode
data = b'{"v-c-merchant-id":"merchantID","alg":"RS256","kid":"7078633285250177041499"}'
encoded = base64.urlsafe_b64encode(data)
stripped = encoded.decode('ascii').strip('=')

print(stripped)