curl --location --request POST "https://api.kashimi.tech/api/v1/auth/token"
--header "Content-Type: application/x-www-form-urlencoded"
--header "Accept: application/json"
--header "Authorization: Basic BASE64_CLIENT_CREDENTIALS"
--data-urlencode "grant_type=client_credentials"
--data-urlencode "scope=payments:read payments:write providers:read"

{
  "access_token": "YOUR_ACCESS_TOKEN",
  "token_type": "Bearer",
  "expires_in": 1800
}

{
  "error": "invalid_request",
  "error_description": "Missing parameter: `client_secret`"
}

{
  "error": "server_error",
  "error_description": "The authorization server is currently unavailable"
}