Can I store them in the Legacy hold?
#What happens to my extra credits (one million+) when my subscription ends?
still cape
pliant light
yes you should put them in legacy cargo hold otherwise they would go to esgrow ... there are a few things you might want to keep in mind other than that... if you have 2 combat styles, you should make sure the one active reflects the one you want to be stuck with since you can't use the second when most subscribed... this guide has other info to help https://swtorista.com/articles/swtor-preferred-tips/
