Make things as frictionless as possible like PayByPhone has done with their Progressive Web App for paying for parking.
Having tried to force apps on people, we often ran into forgotten iCloud & Google Account passwords preventing or slowing installation of our free app. Moving to a PWA made it as simple as emailing or texting a link to add users.
PayByPhone users typically start the process of payment when they are already parked in a spot and only need to pay using the web app. This means that they already have the parking meter to lead them to the URL to do only one task in the process -payment.
Our goal is an end-to-end process of locating, reserving, and paying for charging on a single app. It helps users save time in driving from one charging location to another by letting them reserve when they need to. In theory, it can all be done through a web app but having a mobile app on hand always makes sense for users who constantly have trouble locating free spots and need to reserve on the go.