1. Provide relevant proof of work: If you need to provide proof of work when applying for a credit card, you can issue the applicant's proof of work to the personnel department or the competent department of the unit.
2. Provide other proof of income: If you can't provide valid proof of work, the applicant can also provide credible proof of income source through other channels, such as tax payment certificate, social security certificate, credit report, etc.
3. Apply for a guarantor: If your credit status is poor and you can't provide valid proof, you can find a guarantor to support your credit card application.