I currently use payment links which my clients, and I love. However, my industry is tip heavy so it would be great to see an ‘add tip’ option on the link.
Perhaps with options such as x%, £value and a ‘round up’ choice.
One further, it would be great if tips could go straight into a separate pot!
What industry are you if tips are heavy?
Adult industry?
Your hair stylist must offer different services than mine.
Which is my answer to @Carlo1460 independent hair stylists are probably a big player in this category, especially the rent a chair ones that operate out of a salon, which a large part of the cost of your haircut goes towards.
No babe. Widen your horizons 
So not Only Fans.
Surely if receiving tips by card you just categorise the inbound payment as two cats to reflect income for “hair” and then a tip for the tip.