In order to clarify if and why you did not receive a payment, please check the following:
When was the payment for Invoice due?
Please keep in mind that Invoices are paid 30 days after creation date. Keep in mind that the payment can take additional 2-3 days, if the original payment day is scheduled for a weekday on the weekend.
Provide us the Credit Nr. starting with 60XXXXX
Provide us the Author ID
Should the payment been made via Bank or PayPal transfer?
In case the payment did not reach you via PayPal please read more here. How to verfiy my PayPal account
What has been the issue with your payment we would like to provide us with the following information. Please send your request always to firstname.lastname@example.org