How do you pay for your shipping via USPS?

[Deckard7]

I'm wondering what solutions people might have for paying for their first class USPS shipping for trades on SCF. I use Click-N-Ship for the PC in order to print my labels and get a free delivery confirmation number with it. However, I can't pay for shipping through the program, I have to go to the post office. I could use stamps, but ideally I'd love to be able to use the money from PayPal or a credit card.

I know if you use PayPal you can print labels, but I'm referring to trades only with no payments involved. The USPS website allows you to print a label and ship, but it only works with priority or express mail, can't do it with first class.

I don't do a high enough volume in shipping to get a postal meter or anything, I'd just like to avoid standing in line to pay at the P.O. if I can help it. Maybe I'm missing something obvious, I dunno.

Thanks for any help.

[Deckard7]

Just to update this...turns out you can use PayPal to do shipping even if no money is changing hands. The "Multi-order Shipping" option was not appearing to me on my account page until after I went into My Profile and changed some settings for shipping. Works like a champ once you know how to get into it.

Thanks to alassandro11 for helping me with this via PM.