extend (one) credit
To allow someone to owe money or use credit. They won't extend me credit anymore, not with all the money I owe.
extend credit (to someone or a company)
and extend someone or a company creditto allow someone to purchase something on credit. I'm sorry, Mr. Smith, but because of your poor record of payment, we are no longer able to extend credit to you. Look at this letter, Jane. The store won't extend credit anymore.