Hello @color_kiddo,
Welcome to the PayPal Community! I'm sorry to hear you're running into issues using a different card to pay for your pay in 4 plan. If you've run through the normal troubleshooting steps and cleared your browser's cache, cookies, and recent browsing history, I'd recommend reaching out to our Customer Support teams for a bit more help. You can reach our Customer Support by clicking Contact at the bottom of the PayPal website.
Good luck!
- Jon K
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