There is already a guide that explains the whole process with images.
Processing that kind of requests may take up to 72 working hours. If after that time there is still no response, it is recommended to raise a ticket so that a technician can investigate the reason of the delay.
Once the registration request is approved, it is possible to create an application. There is a guide with images that may simplify following the process.
Each application type has different permissions associated. Therefore, choosing one application or another highly depends on the use that is intended:
Self-Developer: An internal team of developers will create an integration with the inted of selling the company's products into AliExpress.
Commercial-Developer: A company creates an integration service that then will be commercialized allowing third-party companies cooperate with AliExpress.
Dropshipping: Instead of selling products into AliExpress, the objective is selling AliExpress products into a personal web or platform.