1.customer register success event
WordPress: user_register
2.customer login
WordPress: wp_login
3.sales order place after
WP E-Commerce: wpsc_purchase_log_save
4.Hook function to change order shipping status from wp-admin end
WP E-Commerce: wpsc_update_purchase_log_status
To identify the status:
INCOMPLETE_SALE = 1;
ORDER_RECEIVED = 2;
ACCEPTED_PAYMENT = 3;
JOB_DISPATCHED = 4;
CLOSED_ORDER = 5;
PAYMENT_DECLINED = 6;
REFUNDED = 7;
REFUND_PENDING = 8;