From Amir's testing:

The initial name and email form is nearly perfect, but it has some little issues:

• The lock icon next to the "Billing information" title is too close to the text. See the screenshot. It has some padding in English, so in the Hebrew version it probably has padding on the wrong side.
• The "ILS" code is correct and standard, but it is rarely used in Israel this way. It should be replaced with the the shekel sign "₪" or the Hebrew abbreviation "ש״ח". These will be much easier to understand. If I inspect the #selected-amount in the browser developer tools and replace "ILS" with "₪", it looks perfect.

The credit card number form that opens next has a few issues:

• The green label next to the CVV field is broken and hard to read. It's a link that is supposed to help, but it can only add more confusion. Making the #card.cvcWhatIs element explicitly dir="rtl" would make it much better.
• Also, the #card.cvcWhatIs element breaks to the next line. It would be nice to ensure that it appears in one line. See the screenshot.
• It's best of all not to pre-fill the card holder name. In Israel people will are likely to write the name int he top form in Hebrew, but the credit card holder name in English. To avoid confusion, don't prefill. And it's OK that this filled is LTR.
• It is also OK that the card number and the CVV input fields are LTR. They must remain LTR in any case.
• The fact that the whole form has LTR orientation doesn't make it unusable, but it does it make it ugly :) Last year it looked perfect, so it would be nice to make it perfectly RTL this year, too.