The thing is that there is no submit/download a certificate from this new Google developer console.  They just provide a box for you to copy , I guess, the certificate code ie .   IIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiW9KWZIofIO9pirZInSKg3nITST LD7+lOAnR7zaGANp143Sfm3npjgVylttbnzxJSNsPLkLAZ+t8KIjDh+ndQsPfiHeWGx/fg x/eYGeDy90xqCcIOdfjPXBuzmn/V220gL0Qm4Ti526+4GaQvanLuuERvpoUBqR...

etc gobbledygook, so I think the question is how do we make a .p12 out of that?   I use OpenSSL to make a .p12 happily when I have a CertificateSigningRequest.certSigningRequest as per IOS  but otherwise not sure where to go with this new system.

Could it be the end of Flash and android apps?

In the end I uploaded with my own flash generated .P12 and it went through OK. The only concern I have now is whether the app links to their payment system.  It seems that if you have a free app then you can self sign but reading between the lines they sort if indicate that you need their own licensing certificate for linking the app to their accounting system - I might be totally wrong here, anyway will see.

Ok Adobe you owe me big time, it took me ages to figure it out.  Here is the way to incorporate Google Play's new public security certificate that is now needed for paid apps.

Step 1
Download and install OpenSSL (see the YouTube video http://www.youtube.com/watch?v=mpzSXAW0qUI)

Step 2
Create a new P12 self-signed certificate and private key in Flash CS5.5 or CS6 in the Air for Android Settings/deployment tab section and copy it to the C:\openSSL\bin directory.  For the sake of this tutorial call it FlashCreated.P12

Step 3
Open a command prompt and navigate to the OpenSSL\bin directory, ie cd\OpenSSL\bin

Step 4
Type the command  
set OPENSSL_CONF=c:\openssl\bin\openssl.cfg

Step 5
You need to decode the FlashCreated.P12 key to create a PEM file with the command
openssl pkcs12 -in FlashCreated.p12 -out FlashCreated.pem -nodes

Step 6
Use a text editor and take a look at this FlashCreated.pem file

Step 7
Strip out stuff not enclosed within the "-----BEGIN ... KEY-----" and "-----END... KEY-----" delimiters.

Step 8
Go to the Google Play Developer's Console and copy the public key that they provide into a MS WORD document.

Step 9
You need to copy this text in junks of 64 characters and past them below the existing Private Key section and within the delimiters.
-----BEGIN RSA PUBLIC KEY-----
-----END RSA PUBLIC KEY-----

use the MS Word count tab (bottom left of screen) to see the number of characters you select. Most important - ensure that there are no spaces, so 64 64

Step 10
Once you have the 3 sections complete, ie Private Key, Public Key and Self Signed Certificate, convert this pem file back to a P12 using the same password with the command
openssl pkcs12 -export -in FlashCreated.pem -inkey FlashCreated.pem -out Google.p12

Hope this works for you.

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