At present, many contractors can sign contracts by themselves on their own websites, but only if you register an account. After the account registration is successful, select Login, then choose the package, then upload the IPA package, then conduct the payment test, and finally sign the contract. It's actually quite simple. Just follow the tips on the website. If the signer's website can't self-sign, you only need to send IPA to the corresponding customer service, which usually takes a few minutes to complete.
For most APP developers and operators, it is really difficult.
In recent years, due to the vigorous development of the signature industry, the market has become increasingly mixed, resulting in a large number of certificates being banned and fewer and fewer certificates on the market. The number of certificates has increased from a few thousand at the beginning to hundreds of thousands of millions now. In terms of financial strength, many operators are far behind. In addition, Apple's official review of enterprise certificate applications is becoming more and more strict. For example, to what extent the enterprise scale should be reached, it is necessary to have certain qualifications, which many developers and operators can't do. One more thing, in terms of time period, it usually takes several months, which many APP operators can't afford. If you can do all these advantages, then you can also do your own signature.