Bad Request Error 400 The request is malformed or invalid.

Here's what's failing -- help!

curl --location --request POST 'https://apple-pay-gateway.apple.com/paymentservices/paymentSession'%C2%A0%5C --header 'Content-Type: application/json' 
--header 'merchantIdentifier: merchant.com.discounttire.prelive' 
--header 'displayName: Discount Tire' 
--header 'initiative: web' 
--header 'initiativeContext: stg.discounttire.com' 
--data-raw ''   And   curl --location --request POST 'https://apple-pay-gateway.apple.com/paymentservices/paymentSession'%C2%A0%5C --header 'Content-Type: application/json' 
--header 'merchantIdentifier: merchant.com.discounttire.prelive' 
--header 'displayName: Discount Tire' 
--header 'initiative: web' 
--header 'domainName: stg.discounttire.com' 
--data-raw ''

Is this a result of not doing....

Note To access the sandbox environment, use POST https://apple-pay-gateway-cert.apple.com/paymentservices/registerMerchant. first?