Slidepay is essentially a white-label version of Square. Square doesn’t currently offer an API for third-party developers, but hasn’t ruled out the possibility of building one. There are some strategic reasons for this beyond preserving a high-quality customer experience. The more of a direct relationship that Square can have with its customers, the more opportunities it has down the line to earn a cut of revenue through future services and products without being crowded out by more powerful players in the payments ecosystem. But that also leaves room for a white-label service like Slidepay to exist.