Asynchronous to multiple synchronous calls

Hi,

so far , I've only done simple scenarios in PI.

Now , I need to make an asynchronous call from ECC to PI and then in PI , I need to call three web services,

1) authentify

2) read data

3) update data

Where operation 2 only is called if 1 is successful and 3 if 2 is successful.

I need to use an Integration Process for this ??

Any good recommendations for this scenario ?

What do I use to manage the errors ... advise users that an error occured in the web service calls. I beleive you can use an email alert for this.

Thierry