Once a user has reviewed their capture preview, they may choose to pay for the data to be processed. In order to do so, a payment method must have been set up on the account - information on how to do this can be found in this article.
To Pay & Process a capture:
"Quantity" as shown above denotes the number of individual images to be stitched - this, multiplied by the unit price of $0.025 results in the total cost shown.
Upon payment successfully going through, the processing of the capture will commence - see this article for further details on monitoring the processing of data.