gistfile1.txt

// Step 1: Integrate the api_sdk as well in app/build.gradle
compile ('com.trustvision:tv_api_sdk:1.0.17@aar') {
    transitive = true
}

// Step 2:
// If the image is in base64, convert it to byte array
// use something like below
// byte[] decodedString = Base64.decode(base64String, Base64.DEFAULT);

// Step 3: Use its method to upload the image.
byte[] imageData = new byte[30];            // data of your image from your backend
String imageName = "name_of_your_image";    // this can be null
TVApi.getInstance().uploadImage(imageData, imageName, null,  new TVCallback<TVUploadImageResponse>() {
    @Override
    public void onSuccess(TVUploadImageResponse tvUploadImageResponse) {
        if (tvUploadImageResponse != null) {
            String imageId = tvUploadImageResponse.getImageId();
            // send this imageId to the faceCompare TS SDK method and the other image
            // that you capured
        }
    }

    @Override
    public void onError(List<TVApiError> list) {
        // handle error
    }
});