Versus piss around with integration (any software engineer knows this is a time sink), breaking API changes, subscription management and billing, PATRIOT act data protection issues (what happens if PI data is in the request?) as we're in the UK, the risk that one day you disappear off the planet and finally actually throwing client confidential information by email.
It actually took 47 minutes looking at my work log and if I remember a lot of that was making the error page look nice.
It doesn't add up. sorry.
In the build vs buy debate the time versus money theory rarely applies.