Hi Erick! I understand that this is not exactly what you're looking to achieve, as from what I understand it'd be best to have the ability to do this in bulk, but in the meantime I still wanted to suggest the "annotation" feature, which allows you to add a note to a payment. Here's how you can add a note to a payment to mark it as reconciled : https://support.zeffy.com/how-can-i-add-a-note-to-a-transaction

Another great option to consider, depending on your needs, might be to look into our integration with QBO. Using Zapier, all Zeffy payments could be automatically pushed to Quickbooks. Here's how it works : https://support.zeffy.com/do-you-integrate-with-quickbooks