This endpoint allows bulk cancellation of credit memos. Each credit memo is processed independently,
enabling partial success scenarios where some credit memos may be cancelled while others fail validation.

Conditions:

• Only credit memos with status 'Approved' and payment status 'Uncredited' can be cancelled.

Effects of Cancellation:

• Credit memo status is updated to 'Cancelled'.
• All related Credit Memo Line Items are Cancelled.
• Billing Header Rollup - Total Credit Memo Amount and Total Pending Amount are updated.