The Take Customer's Signature checkbox lets you control whether the mobile app will offer to capture the customer's signature upon invoice creation.
You can also make invoice signing mandatory and unskippable by checking "Customer's Signature is Mandatory".
If Suggest changing the item prices in related unpaid invoices when modifying the item prices in the sales order is checked, HandiFox Online will allow you to update prices on invoices linked to the edited prices on the sales order without having to manually update them on the linked invoices.
Here you can adjust the numbering patterns for your sales transactions. For details, see Transaction Numbering.