curl --location --request PATCH '/v2/domainnames//apimappings/' \
--header 'Content-Type: application/json' \
--data-raw '{
"apiId": "string",
"apiMappingKey": "string",
"stage": "string"
}'
{
"ApiId": "string",
"ApiMappingId": "string",
"ApiMappingKey": "string",
"Stage": "string"
}