Loan Payoff Request correspondence on SSFCU letterhead. Dear APPLICANT: Effective today we have withdrawn your application for assistance.The Credit Human Member Service Center is available to help you Monday-Friday 7 am to 7 pm and Saturday 9 am to 12 pm CT. Just call toll free at 800-688-7228. If I plan to payoff my loan, must I send a regular payment? Every student who could benefit from financial assistance should fill out this free application to determine eligibility for government financial aid programs. It's fast, easy, secure, and free. Loan Payoff Address Standard Mailing​ PO Box 7000. Security First Credit Union is the largest "homegrown" credit union in the Rio Grande Valley. We pride ourselves on being "from the valley, for the valley." Frequently Asked Questions (FAQs) about PSECU banking, payments, transfers, loans, support, digital banking, credit cards, and more.