I took these ones from my signature, feel free to use them, and try imgur again. It's what I use
<img src="https://upload.wikimedia.org/wikipedia/commons/f/f1/Apple_Card.png" width="70" border="0" title="Apple Card" />
<img src="https://i.imgur.com/fViTBry.png" width="70" border="0" title="Synchrony Paypal Credit Card" />
<img src="https://i.imgur.com/zq35ewZ.jpg" width="70" border="0" title="NFCU cashRewards Plus Visa Signature" />
<img src="https://i.imgur.com/5Z3igym.png" width="70" border="0" title="Discover"/>
