Client receives “403 Forbidden” message

This means you have requested POW and/or sent POW result with data very fast recently. The rate limits can be found here. Note, everything is x2 because to send 1 successful chunk of data, your Albion Online Data client must request a POW then submit the POW result + data. So, for example, per_minute is 270*2, which means you can send 270 chunks of data per minute before being throttled.