California Code, Civil Code - CIV § 1802.19

(a) For the purposes of this chapter, a retail installment contract, contract, retail installment account, installment account, or revolving account shall be deemed to have been made in this state and, therefore, subject to the provisions of this chapter, if either the seller offers or agrees in this state to sell to a buyer who is a resident of this state or if such buyer accepts or makes the offer in this state to buy, regardless of the situs of the contract as specified therein.

(b) Any solicitation or communication to sell, oral or written, originating outside of this state, but forwarded to, and received in this state by, a buyer who is a resident of this state, shall be deemed to be an offer or agreement to sell in this state.

(c) Any solicitation or communication to buy, oral or written, originating within this state, from a buyer who is a resident of this state, but forwarded to, and received by, a retail seller outside of this state, shall be deemed to be an acceptance or offer to buy in this state.