PaymentStep sent the toman amount straight through as amount_rials (and the
fixed discount value as discount_value), so a 500,000 toman payment was stored
as 5,000,000... no — as 500,000 rial (10x too small). Apply tomanToRial before
sending the payment amount and the fixed-discount value; percent discount and
rule-based discount are unaffected. Verified stored value is now correct rial.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
