Currently there isn't a counter for how many barcodes you have remaining for each Royal Mail OBA service but what you can do is track how many you have left using the reporting page.
If you click on your email at the top of the screen in Shiptheory the user drop-down menu will appear, from here you can select the 'Reporting' option to go to the reporting page, alternatively you can click on this link: https://helm.shiptheory.com/reports
Once you are on the Reporting page you will be able to set a period of time so that you can see how many shipments you have sent out in that period of time by clicking on the small calendar icon at the top of the page. You can go from the previous week to the last 12 months, or you can set a specific time period by selecting the start and end date for the period so that you can check how many shipments have been sent out in that period.
Once you have selected your time frame you will need to scroll down the page until you get to the "Services Breakdown" graph, this will tell you how many shipments you have sent out with different carrier services, from here you will need to find how many shipments have been sent out with the desired Royal Mail OBA service and then retract that number of shipments from the amount of barcodes you were given.
To find out how many barcodes you have left you will need to contact our support desk and we will be able to let you know, typically you will have 9999 barcodes added to your account at the beginning of each cycle but if you are unsure or have any questions feel free to get in contact with us.