subscription: Subscribe and unsubscribe endpoints
In samuelmacedo83/raws.sns: Send Notifications Using Amazon SNS

Subscribe one or more users to a topic and unsubscribe them using their endpoints. For better performance, use the endpoint ARN on unsubscribe(). You can retrieve these ARN's in your SNS account on Amazon or using list_subscriptions().

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subscribe(topic, protocol, endpoint, profile = "default")

unsubscribe(topic, endpoint, subscription_arn, profile = "default")

`topic`	A topic name or topic ARN.
`protocol`	A string or a vector of strings with the protocol. "sms" and "email" are supported. If you have a vector of endpoints with the same protocol, you just need to specify the protocol once, not a vector of protocols.
`endpoint`	A string or a vector of strings with users that you want to subscribe. Use a valid email and for SMS use a complete cell phone number, for example: "+558112345678".
`profile`	Your profile name in AWS. If profile was not supplied this function will use the default profile.
`subscription_arn`	A string with the user's ARN. Use this for better performance in `unsubscribe()`. You can check the endpoint ARN in SNS account or using the `list_subscription()`

## Not run: 
# subscribe a user
# subscribe(topic = "your topic",
             protocol = "sms",
             endpoint = "+0012345")

# subscribe more than one user with a singe protocol
endpoint <- c("user1@email.com", "user2@email.com", "user3@email.com" )
subscribe(topic = "your topic",
          protocol = "email",
          endpoint = endpoint)

# subscribe more than one user with differents protocols
endpoint <- c("user4@email.com", "+0054321", "user5@email.com" )
protocol <- c("email", "sms", "email")
subscribe(topic = "your topic",
         protocol = protocol,
         endpoint = endpoint)

# unsubscribe a user
unsubscribe(topic = "your topic",
            endpoint = "+0012345")

# unsubscribe more than one user
unsubscribe(topic = "your topic",
            endpoint = c("user4@email.com", "+0054321"))

# use the endpoint ARN for better performance
unsubscribe(topic = "your topic",
            endpoint_arn = "arn:aws:sns:your_topic:12345")

## End(Not run)