It’s hard, it’s time consuming and sometimes impossible to do. It happens quite often since your app is not integrated with other apps your potential customers are using.
Everyday you have to deal with a nightmare: multiple projects at once, running product development, improving sales & marketing. Lack of people and time often ends with no possibility to integrate your software with other apps your customers need. Integration itself can be pricy and problematic.
Every business owner wants to improve own business and company. It means you’d rather need to focus on sales and marketing, all the rest is lower priority and a bigger challenge to handle.