Amazon's signature methods are mainly as follows:

1. Electronic signature: In the process of opening a store on Amazon, electronic signature is mainly used to confirm the seller agreement, identity authentication and other links. You need to provide a valid email address and mobile phone number to receive the verification code during the authentication process. Electronic signature can be completed through a computer, mobile phone or other electronic device.

2. Credit card authentication: During the registration process of opening a store on Amazon, you need to provide credit card information, including card number, cardholder name, billing address, etc. This is a way for Amazon to conduct a qualification review of sellers to ensure that the seller has a good credit background.

3. Identity documents: Amazon may require you to provide identity documents such as ID card and business license to verify your identity and store qualifications. These documents usually need to be notarized or authenticated to ensure their authenticity.

4. Tax Identification Number (TIN): In some countries and regions, Amazon may require you to provide a tax identification number. This is a unique identification number assigned by the tax department to taxpayers for tax declaration and tax preferential policies.

5. Authorization: If you authorize someone else to act on your behalf to handle matters related to opening a store on Amazon, you need to provide an authorization letter. The authorization letter should clearly state the scope of authorization, authorization period, and the identity information of the authorized person.

6. Third-party certification: Amazon may also require you to provide third-party certification, such as SSL certificate, ISO certification, etc. These certifications help improve the company's reputation on the Amazon platform and attract more buyers.

Please note that Amazon's store opening policies may vary in different countries and regions. Please refer to local policies for specific requirements. When providing your signature, please ensure that the information provided is true and valid to avoid affecting the store opening process.