I worked with an ecommerce shop for a while that wanted to go with the cheaper payment processor through their bank.
We spent a lot of developer time getting that 0.05% rate difference to work. Yes, that's a lot over a year, but we were constantly discovering undocumented error codes and "interesting" corner cases. The processor went down often enough that we actually ended up configuring a backup payment gateway on top of it (manual failover -- and yes it was well used). A year later and we still didn't have all the bugs ironed out.
Additionally the "PCI Scan" through the bank couldn't handle a DNS name, only a fixed IP address. This was one among many other issues with the PCI scan that ended up wasting weeks of developer time. In the end they literally gave up on scanning the site and just gave it a pass.
Believe it or not (I didn't at the time) there's actually more to card processing and banking than just a rate. You definitely get what you pay for.
We spent a lot of developer time getting that 0.05% rate difference to work. Yes, that's a lot over a year, but we were constantly discovering undocumented error codes and "interesting" corner cases. The processor went down often enough that we actually ended up configuring a backup payment gateway on top of it (manual failover -- and yes it was well used). A year later and we still didn't have all the bugs ironed out.
Additionally the "PCI Scan" through the bank couldn't handle a DNS name, only a fixed IP address. This was one among many other issues with the PCI scan that ended up wasting weeks of developer time. In the end they literally gave up on scanning the site and just gave it a pass.
Believe it or not (I didn't at the time) there's actually more to card processing and banking than just a rate. You definitely get what you pay for.