Is ther any problems with ordering the arba minim with a credit card?Does one have to pay the cradit card before the chag? Is it lchatchila?
It is best not to use a credit card for paying for the 4 minim.
If it is used, the best option is to give a partial cash payment, which can be small, and to pay for the rest with the credit card.
However, if a credit card is used, one can still use the minim, and one should ensure that they are brought home so that one makes a kinyan chatzer on them.
For details, please see here under the section dealing with credit card payments.