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PseudodarwinistPseudodarwinist 

Marketing Cloud API- Messaging

Hi All,
 Can somebody answer below queries related to Marketing Cloud Email API which we shall be using for sending customer emails.
DO we need to use SOAP API or REST API?
Current throughput of the service and maximum supported (number of API calls which client can make .  eg. 100 request per sec.).   Is there any restriction on the number of API calls which we can make to this API as online calls.
Current response time and minimum/maximum response time for the Email API.
Is there any restriction on the payload size for this API ?
How soon the email messages are sent to the recipient when the API receives the request from client ( for eg. within 1 sec). We have an end to end SLA of 3 seconds for the high priority messages.
Is there any retry mechanism built within the Salesforce API side for the failed message delivery and is it configurable.
What is the authentication mode supported by this Salesforce Email API.
Any immidiate response is much appreciated