username:password
Authorization: Basic *****************
curl --location -g --request POST 'https://api-m.sandbox.paypal.com/v1/customer/disputes/{{dispute_id}}/deny-offer' \
--header 'Content-Type: text/plain' \
--header 'Authorization: Basic Og==' \
--data-raw '{
"note": "refund offer is very low."
}'
{
"error": "invalid_token",
"error_description": "Token signature verification failed"
}