Hiw do I get a magstripe reader that fits my Samsung 21 5G

[Judesca]

I have a Square account. How do I get a magstripe reader for my Samsung 21 5G

[ninja502]

you can try a 

onn-3-5mm-to-USB-C-Audio-Adapter-Cable-Connects-Headphones-To-Smartphones-Tablets/ 

to use the old mag strip reader