keys.go
func (c *KeyService) Create(ctx context.Context, data url.Values) (*Key, error) {
	key := new(Key)
	err := c.client.CreateResource(ctx, keyPathPart, data, key)
	return key, err
}
func (c *KeyService) Create(ctx context.Context, data url.Values) (*Key, error) {
	key := new(Key)
	err := c.client.CreateResource(ctx, keyPathPart, data, key)
	return key, err
}
// Create a new Key. Note the Secret is only returned in response to a Create,
// you can't retrieve it later.
//
// https://www.twilio.com/docs/api/rest/keys#list-post