I got this international stamp from the self-service kiosk, does it work the same as a regular stamp when I put it on a postcard? : r/USPS

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When sending out a letter/mail, am I allowed to decorate the outside of the envelope with stickers or doodles and still send it out as long as there's a stamp and the

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International Stamps : r/USPS

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Order online I purchased priority mail postage from the self serve machine at, usps tracking number