Totally incompetent, reckless and do not care about their customers whatsoever
AVOID AT ALL COSTS.
Amateur hour if I ever saw it: they change their entire API endpoints on a whim on the SAME VERSION, breaking all of the work you've done to integrate with them (thousands of $), then tell you you're not an $5k / month Enterprise customer and they don't really support their self serve product so...tough luck buddy. I was one of their first customers and have been using them for over a year and a half only to wake up one day to customer complaints because our integration had broken and be told they basically don't care about.
After I reached out to their team, it became clear that they had simply changed their entire API from one day to the next on the same version, with no notice and a documentation that doesn't reflect the changes they made.
Literally everything is broken in one way or another: the UI fails to save changes every other try, the API has three different versions in use at the same time, some endpoints use v3 others use v4, similar payload responses don't even reply with the same structure for the data, the documentation is completely out of sync with the actual endpoints, the webhooks trigger 3 times in a row and on and on and on...
Somehow they have several engineers, yet no-one there actually knows how to fix your problem.
I've been a customer for over a year and a half and after breaking my entire integration, they just told me to go take my business elsewhere because they couldn't support their OWN breaking changes! Oh and by the way, it took a week of back and forth and trying to fix my integration and work with their broken documentation to tell me this.
Total insanity. I couldn't ever imagine being an Enterprise customer with these people, their whole product is built on a shoestring and they have absolutely no respect whatsoever for their customers.
Businesses like this deserve to be buried deep deep in the ground.