Where is my quora credit?

Well, recently, quora has not discontinued the usage of credit. They have switched to another reward system which is introduced as follows.

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How the new Ask to Answer system will work:
Ask to Answer requests will no longer cost credits. Anyone can send an Ask to Answer request to anyone else. Ask to Answer requests will be prioritized based on both quality and volume. High priority requests will go directly to the intended recipient and other requests will be aggregated. Prioritization will be based on a number of factors, including: 

1. How many requests the target writer receives and subsequently answers over a period of time.
2. Whether the specific question is tagged with a topic that the writer has expertise in and/or which is listed in the writer's Knows About profile section.
3. Whether the request is sent from a person that the writer follows and/or interacts with regularly.

Regarding notifications about Ask to Answer requests:

• For high priority requests: As before, for each of these requests, you will get individual notifications:

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Find here for more details.