Payment sessions

BASE_URL=${PEPAY_API_URL}

curl "$BASE_URL/api/v1/payments/session-details" \
  -H "x-session-token: pst_..." \
  -H "x-signature: sig_..."

{
  "invoice_id": "550e8400-e29b-41d4-a716-446655440000",
  "amount_usd": 49.99,
  "description": "Starter plan",
  "expires_at": 1766322000,
  "invoice_status": "unpaid",
  "remaining_time": 3600000,
  "remaining_seconds": 3600,
  "merchant_name": "Pepay Demo Merchant",
  "merchant_email": "billing@example.com",
  "network_environment": "devnet",
  "locked_network": null,
  "locked_token_id": null,
  "locked_payment_address": null
}