Here's how to give a client credit, for example after a cancelled walk, and use it to pay towards their invoices.
Add a credit note
Tap Clients and open the client.
Under Credit notes, tap Add credit note.
Enter the Amount and a Reason. Add Private notes just for you if you like.
Save it. Your client is told they have credit.
Use credit on an invoice
Open the invoice.
Tap Credit at the top.
Tap the credit note. The amount that fits the invoice is filled in.
Tap Done. The credit is taken off what they owe, and shows on the invoice.
Take credit back off
Tap the credit on the invoice's Payments list, and choose Remove. The credit goes back to your client's balance, and the invoice is reopened for that amount.
Good to know
Credit works on any invoice, including Walkies Pay ones.
You can void or delete a credit note from the note itself.
Only admins and sub-admins can add credit.