APIs, especially modern RESTful APIs,
are a nice creation that can certainly 
simplify and accelerate integration efforts,
which makes it more likely you will
benefit from them. But APIs can and
do change for various reasons, sometimes 
abruptly, and hence REST APIs do not differ
from traditional integration methods 
in this respect. If an API call is
obsolete and disappears, your procedure
will interrupt and it is important to
understand how often the APIs you depen
d on change or are deprecated.