Android Question Google Billing 5: OfferToken for single subscription offer

[toby]

I'm upgrading Google Billing to v5, which is required by Google, and after reading all the relate information, the purchase totken issue is still confusing me.

I got the code below from this post: Source: https://www.b4x.com/android/forum/t...-due-to-google-restriction.142524/post-903185

Private Sub LaunchBillingFlow (Client As BillingClient, Sku As SkuDetails, OfferToken As String) As BillingResult
    Dim ctxt As JavaObject
    ctxt.InitializeContext
    Dim ProductDetailsParamsBuilder As JavaObject
    ProductDetailsParamsBuilder = ProductDetailsParamsBuilder.InitializeStatic("com.android.billingclient.api.BillingFlowParams.ProductDetailsParams").RunMethod("newBuilder", Null)
    ProductDetailsParamsBuilder.RunMethod("setProductDetails", Array(Sku))
    ProductDetailsParamsBuilder.RunMethod("setOfferToken", Array(OfferToken))
    Dim ProductDetails As List = Array(ProductDetailsParamsBuilder.RunMethod("build", Null))
    
    Dim BillingFlowParamsBuilder As JavaObject
    BillingFlowParamsBuilder = BillingFlowParamsBuilder.InitializeStatic("com.android.billingclient.api.BillingFlowParams").RunMethod("newBuilder", Null)
    BillingFlowParamsBuilder.RunMethod("setProductDetailsParamsList", Array(ProductDetails))
    
    Return Client.As(JavaObject).GetFieldJO("client").RunMethod("launchBillingFlow", Array(ctxt, BillingFlowParamsBuilder.RunMethod("build", Null)))
End Sub

In my app, there is only a single in-app product for purchase which is a subscription. Can I just pass an empty string as the OfferToken? If no, how to get it?

TIA

 

[Erel]

Can I just pass an empty string as the OfferToken? If no, how to get it?

Yes, though it is better to set something more meaningful just for the case where you add more offers in the future.

 

[toby]

For reason unbeknownst to me, I had to pass an empty token (offerToken="") in order for it to work and to avoid the fatal error "There was some error on our end. Please try again" when executing the following line

 Return Client.As(JavaObject).GetFieldJO("client").RunMethod("launchBillingFlow", Array(ctxt, BillingFlowParamsBuilder.RunMethod("build", Null)))