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Pakistan also purchases electricity from Iran but pays through Bartering wheat. Likewise Asian countries use net settlement mechanism using Asian Clearing Union (ACU) e.g. If India Owes Iran , Iran Owes China, Iran's payable can be set off against Iran's receivables from India and thus net settlement occurs. However, this system is restricted and just like barter.
Edit:
China buys Iranian Oil and pays back in Chinese Yuan (Not in $,Euro or Yen), So effectively Iran accepts Chinese Currency to hold in its reserves
BBC News - China buying oil from Iran with yuan
However, Chinese are smart and don't use their own banks to do so because doing so would put their international trade financing in jeopardy if US/EU black list them but rather use Russian banks to do so.
Similar might be the case with India where Central Bank of Iran might be piling up India Rupee reserves as consideration of Oil payment.
US and EU are still our biggest export markets so
Pakistan's own banks and even the Chinese banks walked away from Financing the Pipeline. No body likes to irk US. As a recent example, KASB bank (being shia owned) accepted large deposits from Iranian government. However, as soon as traced by the US, the bank's operations were ceased in US and EU and Pakistan imposed a moratorium and merging it with Askari Bank to save the day.So, indians and Chinese and Turks care for their economies, while Pakistani government Cares more for house of Saud then Pakistan. Indians can pay with Indian rupee and Chinese can pay with Renminbi for Iranian oil,without breaking the sanctions Why can't pakistan do the same?