Hello @Dorisia,
Welcome to the community forum and thanks for posting. I am sorry to know that you're not getting an option of Pay in 4. Pay in 3 may not be available for certain merchants. PayPal Pay in 3 as an option may not be available based on our internal checks. Here's the article to know more information. If you need any help regarding the same, please reach out to our customer support through the available contact options.
I hope this helps.
Ayesha
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