I am a beginner with Odoo ( V14.0 ) and its API. 

I managed to perform some actions with trial and error and here, I try to create an invoice based on what I saw passing as data in the Chrome console. 
 
I have advanced step by step and now I don't get any error but I still don't see any invoice appearing. 

Can you help me or give me a procedure? Thanks in advance. 

function new_invoice()  {

$doc = [      
"date" => "2021-08-18",      
"asset_id" => false,      
"show_name_warning" => false,      
"posted_before" => false, 
"payment_state" => "not_paid", 
"name" => "/NEW/PLUS/".date("ymdhis"),
"partner_id" => 20346,      
"partner_shipping_id" => 20346,
"ref" => false, 
"payment_reference" => "UUDYYD" . date("ymdhis"), 
"partner_bank_id" => false, 
"invoice_vendor_bill_id" => false,  
"purchase_id" => false,   
"purchase_vendor_bill_id" => false,   
"invoice_date" => "2021-08-18",   
"invoice_date_due" => "2021-09-17",  
"invoice_payment_term_id" => 4,  
"journal_id" => 1,   
"currency_id" => 1,  
"edi_document_ids" => [],  
"invoice_line_ids" => [    
[          
0,          
"virtual_2375",          
[            
"sequence" => 10,            
"product_id" => 2962,           
 "name" => "[106 -CP] Wit 5 ml doseerpipet",            
"account_id" => 374,            
"analytic_account_id" => false,            
"analytic_tag_ids" => [              
[                
6,                
false,                
[]              
]           
],            
"quantity" => 1,            
"product_uom_id" => 1,            
"price_unit" => 5,            
"discount" => 0,            
"tax_ids" => [              
[                
6,                
false,                
[                  
1                
]              
]            
],            
"partner_id" => 20346,            
"amount_currency" => -5,            
"currency_id" => 1,            
"debit" => 0,            
"credit" => 5,            
"date_maturity" => false,            
"tax_tag_ids" => [              
[                
6,                
false,                
[                  
11                
]              
]            
],            
"purchase_line_id" => false,            
"recompute_tax_line" => false,            
"predict_from_name" => false,            
"display_type" => false,            
"is_rounding_line" => false,            
"exclude_from_invoice_tab" => false,            
"parent_state" => "draft"          
]        
]      
],
      
"line_ids" => [        
[          
0,         
 "virtual_2379",          
[            
"account_id" => 178,            
"sequence" => 10,            
"name" => "UUDYYD",            
"quantity" => 1,            
"price_unit" => -6.05,            
"discount" => 0,            
"debit" => 6.05,            
"credit" => 0,            
"amount_currency" => 6.05,            
"date_maturity" => "2021-09-17",           
 "currency_id" => 1,            
"partner_id" => 20346,            
"product_uom_id" => false,            
"product_id" => false,            
"tax_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"tax_base_amount" => 0,            
"tax_exigible" => true,            
"tax_repartition_line_id" => false,            
"tax_tag_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"analytic_account_id" => false,            
"analytic_tag_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"recompute_tax_line" => false,            
"display_type" => false,            
"is_rounding_line" => false,            
"exclude_from_invoice_tab" => true,            
"purchase_line_id" => false,            
"predict_from_name" => false          
]        
],        
[          
0,          
"virtual_2375",          
[            
"account_id" => 374,            
"sequence" => 10,            
"name" => "[106 -CP] Wit 5 ml doseerpipet",            
"quantity" => 1,            
"price_unit" => 5,            
"discount" => 0,            
"debit" => 0,            
"credit" => 5,            
"amount_currency" => -5,            
"date_maturity" => false,            
"currency_id" => 1,            
"partner_id" => 20346,            
"product_uom_id" => 1,            
"product_id" => 2962,            
"tax_ids" => [              
[                
6,                
false,                
[                  
1                
]              
]            
],            
"tax_base_amount" => 0,            
"tax_exigible" => true,            
"tax_repartition_line_id" => false,            
"tax_tag_ids" => [              
[                
6,                
false,                
[                  
11                
]              
]            
],            
"analytic_account_id" => false,            
"analytic_tag_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"recompute_tax_line" => false,            
"display_type" => false,            
"is_rounding_line" => false,            
"exclude_from_invoice_tab" => false,            
"purchase_line_id" => false,            
"predict_from_name" => false          
]        
],        
[          
0,          
"virtual_2385",          
[            
"account_id" => 221,            
"sequence" => 10,            
"name" => "21%",            
"quantity" => 1,            
"price_unit" => 1.05,            
"discount" => 0,            
"debit" => 0,            
"credit" => 1.05,            
"amount_currency" => -1.05,            
"date_maturity" => false,            
"currency_id" => 1,            
"partner_id" => 20346,            
"product_uom_id" => false,            
"product_id" => false,            
"tax_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"tax_base_amount" => 5,            
"tax_exigible" => true,            
"tax_repartition_line_id" => 2,            
"tax_tag_ids" => [              
[                
6,                
false,                
[                  
47                
]              
]            
],            
"analytic_account_id" => false,            
"analytic_tag_ids" => [              
[                
6,                
false,                
[]              
]            
],            
"recompute_tax_line" => false,            
"display_type" => false,            
"is_rounding_line" => false,            
"exclude_from_invoice_tab" => true,            
"purchase_line_id" => false,            
"predict_from_name" => false          
]        
]      
],      
"invoice_user_id" => 2,      
"team_id" => 5,      
"invoice_origin" => false,      
"qr_code_method" => false,      
"invoice_incoterm_id" => false,      
"fiscal_position_id" => 2,      
"invoice_cash_rounding_id" => false,      
"invoice_source_email" => false,      
"auto_post" => false,      
"to_check" => false,      
"campaign_id" => false,      
"medium_id" => false,      
"source_id" => false,      
"message_follower_ids" => [],      
"activity_ids" => [],      
"message_main_attachment_id" => false,      
"message_ids" => []    
];



    $invoice = $this->models->execute_kw(      $this->db,      $this->uid,      $this->password,      'account.move',      'create',      [$doc],    );
    echo  $invoice; /* ---> It returns a number */ 
    $action  = $this->models->execute_kw(      $this->db,      $this->uid,      $this->password,      'account.move',      'action_post',      [$invoice]    );
    print_r($action); /* It does not return anything */ 
  }