Introduction
In this tutorial, we will create simple examples to send messages via WhatsApp API using C.
First WhatsApp API Message Using C
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/chat");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&body=WhatsApp API on UltraMsg.com works good&priority=10&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Image
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/image");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&image=https://file-example.s3-accelerate.amazonaws.com/images/test.jpg&caption=image Caption&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Document
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/document");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&filename=hello.pdf&document=https://file-example.s3-accelerate.amazonaws.com/documents/cv.pdf&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Audio
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/audio");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&audio=https://file-example.s3-accelerate.amazonaws.com/audio/2.mp3&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Voice
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/voice");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&audio=https://file-example.s3-accelerate.amazonaws.com/voice/oog_example.ogg&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Video
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/video");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&video=https://file-example.s3-accelerate.amazonaws.com/video/test.mp4&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Link
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/link");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&link=https://en.wikipedia.org/wiki/COVID-19&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Contact
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/contact");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&[email protected]&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Location
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/location");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&address=ABC company \n Sixth floor , office 38&lat=25.197197&lng=55.2721877&referenceId=");
CURLcode ret = curl_easy_perform(hnd);Send Vcard
CURL *hnd = curl_easy_init();
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");
curl_easy_setopt(hnd, CURLOPT_URL, "https://api.ultramsg.com/instance1150/messages/vcard");
struct curl_slist *headers = NULL;
headers = curl_slist_append(headers, "content-type: application/x-www-form-urlencoded");
curl_easy_setopt(hnd, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(hnd, CURLOPT_POSTFIELDS, "token=token_here&to=966550883606&vcard= BEGIN:VCARD\nVERSION:3.0\nN:lastname;firstname\nFN:firstname lastname\nTEL;TYPE=CELL;waid=14000000001:14000000002\nNICKNAME:nickname\nBDAY:01.01.1987\nX-GENDER:M\nNOTE:note\nADR;TYPE=home:;;;;;;\nADR;TYPE=work_:;;;;;;\nEND:VCARD&referenceId=");
CURLcode ret = curl_easy_perform(hnd);finally, you can see Full Whatsapp API Documentation and FAQ.