69 Pa. Stat. § 1103
For the purposes of this act a retail installment contract, contract, retail installment account, installment account, or revolving account is made in Pennsylvania and, therefore, subject to the provisions of this act if either the seller offers or agrees in Pennsylvania to sell to a resident buyer of Pennsylvania or if such resident Pennsylvania buyer accepts or makes the offer in Pennsylvania to buy, regardless of the situs of the contract as specified therein.
Any solicitation or communication to sell, verbal or written, originating outside the Commonwealth of Pennsylvania but forwarded to and received in Pennsylvania by a resident buyer of Pennsylvania shall be construed as an offer or agreement to sell in Pennsylvania.
Any solicitation or communication to buy, verbal or written, originating within the Commonwealth of Pennsylvania from a resident buyer of Pennsylvania, but forwarded to and received by a retail seller outside the Commonwealth of Pennsylvania shall be construed as an acceptance or offer to buy in Pennsylvania.
69 P.S. § 1103