Your clients would need to issue you a 1099 if they paid you over $600 by way of cash/checking. If by credit card you would not receive by your client, but rather the merchant company.
Let me share some information about filing a 1099 form.
If you are a sole proprietor, you may be relieved to know that issuing a 1099 form to yourself is not necessary. A 1099 is typically used to report income paid to non-employees, such as freelancers or independent contractors, and is usually issued by businesses that have spent $600 or more to the non-employee during the tax year. This can help you better understand your tax obligations and ensure you comply with IRS regulations.