Rechargly supports negative custom charges, which appear as credits on the client’s invoice.
Steps to follow:
Create a credit for a single invoice:
Go to the Charges page.
Click Add Custom charge.
Select the client and fill out the charge details.
In the Amount field, enter a negative value (e.g. -100.00).
Create credits in bulk:
Go to the Imports page.
Click […] and select Custom CSV Import
Use the CSV template and put negative amounts in
When the charges have been uploaded, you can map these charges to a customer.
Check the Invoices page and confirm that the credits have been applied.