Wordpress Checkout Page errors experts only jQuery / PHP

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Wordpress Checkout Page errors (experts only) jQuery / PHP
I have 3 errors on my WooCommerce checkout page, expiration date is not auto-typing forward slash, and 2 other issues.
EXPERTS ONLY, MUST KNOW PHP AND JQUERY
Thank you in advance.
Skills:
PHP
, WordPress
, JavaScript
, CSS
, jQuery / Prototype

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